diff --git a/td/generate/scheme/td_api.tl b/td/generate/scheme/td_api.tl
index b98875b0..e889f20e 100644
--- a/td/generate/scheme/td_api.tl
+++ b/td/generate/scheme/td_api.tl
@@ -170,6 +170,9 @@ inputFileGenerated original_path:string conversion:string expected_size:int32 =
 //@description Photo description @type Thumbnail type (see https://core.telegram.org/constructor/photoSize) @photo Information about the photo file @width Photo width @height Photo height
 photoSize type:string photo:file width:int32 height:int32 = PhotoSize;
 
+//@description A very poor quality and low resolution image thumbnail @width Thumbnail width, usually doesn't exceed 40 @height Thumbnail height, usually doesn't exceed 40 @data The thumbnail
+minithumbnail width:int32 height:int32 data:bytes = Minithumbnail;
+
 
 //@class MaskPoint @description Part of the face, relative to which a mask should be placed
 
@@ -198,19 +201,20 @@ pollOption text:string voter_count:int32 vote_percentage:int32 is_chosen:Bool is
 
 
 //@description Describes an animation file. The animation must be encoded in GIF or MPEG4 format @duration Duration of the animation, in seconds; as defined by the sender @width Width of the animation @height Height of the animation
-//@file_name Original name of the file; as defined by the sender @mime_type MIME type of the file, usually "image/gif" or "video/mp4" @thumbnail Animation thumbnail; may be null @animation File containing the animation
-animation duration:int32 width:int32 height:int32 file_name:string mime_type:string thumbnail:photoSize animation:file = Animation;
+//@file_name Original name of the file; as defined by the sender @mime_type MIME type of the file, usually "image/gif" or "video/mp4"
+//@minithumbnail Animation minithumbnail; may be null @thumbnail Animation thumbnail; may be null @animation File containing the animation
+animation duration:int32 width:int32 height:int32 file_name:string mime_type:string minithumbnail:minithumbnail thumbnail:photoSize animation:file = Animation;
 
 //@description Describes an audio file. Audio is usually in MP3 format @duration Duration of the audio, in seconds; as defined by the sender @title Title of the audio; as defined by the sender @performer Performer of the audio; as defined by the sender
-//@file_name Original name of the file; as defined by the sender @mime_type The MIME type of the file; as defined by the sender @album_cover_thumbnail The thumbnail of the album cover; as defined by the sender. The full size thumbnail should be extracted from the downloaded file; may be null @audio File containing the audio
-audio duration:int32 title:string performer:string file_name:string mime_type:string album_cover_thumbnail:photoSize audio:file = Audio;
+//@file_name Original name of the file; as defined by the sender @mime_type The MIME type of the file; as defined by the sender @album_cover_minithumbnail The minithumbnail of the album cover; may be null @album_cover_thumbnail The thumbnail of the album cover; as defined by the sender. The full size thumbnail should be extracted from the downloaded file; may be null @audio File containing the audio
+audio duration:int32 title:string performer:string file_name:string mime_type:string album_cover_minithumbnail:minithumbnail album_cover_thumbnail:photoSize audio:file = Audio;
 
 //@description Describes a document of any type @file_name Original name of the file; as defined by the sender @mime_type MIME type of the file; as defined by the sender
-//@thumbnail Document thumbnail; as defined by the sender; may be null @document File containing the document
-document file_name:string mime_type:string thumbnail:photoSize document:file = Document;
+//@minithumbnail Document minithumbnail; may be null @thumbnail Document thumbnail; as defined by the sender; may be null @document File containing the document
+document file_name:string mime_type:string minithumbnail:minithumbnail thumbnail:photoSize document:file = Document;
 
-//@description Describes a photo @has_stickers True, if stickers were added to the photo @sizes Available variants of the photo, in different sizes
-photo has_stickers:Bool sizes:vector<photoSize> = Photo;
+//@description Describes a photo @has_stickers True, if stickers were added to the photo @minithumbnail Photo minithumbnail; may be null @sizes Available variants of the photo, in different sizes
+photo has_stickers:Bool minithumbnail:minithumbnail sizes:vector<photoSize> = Photo;
 
 //@description Describes a sticker @set_id The identifier of the sticker set to which the sticker belongs; 0 if none @width Sticker width; as defined by the sender @height Sticker height; as defined by the sender
 //@emoji Emoji corresponding to the sticker @is_mask True, if the sticker is a mask @mask_position Position where the mask should be placed; may be null @thumbnail Sticker thumbnail in WEBP or JPEG format; may be null @sticker File containing the sticker
@@ -218,11 +222,11 @@ sticker set_id:int64 width:int32 height:int32 emoji:string is_mask:Bool mask_pos
 
 //@description Describes a video file @duration Duration of the video, in seconds; as defined by the sender @width Video width; as defined by the sender @height Video height; as defined by the sender
 //@file_name Original name of the file; as defined by the sender @mime_type MIME type of the file; as defined by the sender @has_stickers True, if stickers were added to the photo
-//@supports_streaming True, if the video should be tried to be streamed @thumbnail Video thumbnail; as defined by the sender; may be null @video File containing the video
-video duration:int32 width:int32 height:int32 file_name:string mime_type:string has_stickers:Bool supports_streaming:Bool thumbnail:photoSize video:file = Video;
+//@supports_streaming True, if the video should be tried to be streamed @minithumbnail Video minithumbnail; may be null @thumbnail Video thumbnail; as defined by the sender; may be null @video File containing the video
+video duration:int32 width:int32 height:int32 file_name:string mime_type:string has_stickers:Bool supports_streaming:Bool minithumbnail:minithumbnail thumbnail:photoSize video:file = Video;
 
-//@description Describes a video note. The video must be equal in width and height, cropped to a circle, and stored in MPEG4 format @duration Duration of the video, in seconds; as defined by the sender @length Video width and height; as defined by the sender @thumbnail Video thumbnail; as defined by the sender; may be null @video File containing the video
-videoNote duration:int32 length:int32 thumbnail:photoSize video:file = VideoNote;
+//@description Describes a video note. The video must be equal in width and height, cropped to a circle, and stored in MPEG4 format @duration Duration of the video, in seconds; as defined by the sender @length Video width and height; as defined by the sender @minithumbnail Video minithumbnail; may be null @thumbnail Video thumbnail; as defined by the sender; may be null @video File containing the video
+videoNote duration:int32 length:int32 minithumbnail:minithumbnail thumbnail:photoSize video:file = VideoNote;
 
 //@description Describes a voice note. The voice note must be encoded with the Opus codec, and stored inside an OGG container. Voice notes can have only a single audio channel @duration Duration of the voice note, in seconds; as defined by the sender
 //@waveform A waveform representation of the voice note in 5-bit format @mime_type MIME type of the file; as defined by the sender @voice File containing the voice note
diff --git a/td/generate/scheme/td_api.tlo b/td/generate/scheme/td_api.tlo
index db20bdfc..709733fa 100644
Binary files a/td/generate/scheme/td_api.tlo and b/td/generate/scheme/td_api.tlo differ
diff --git a/td/generate/scheme/telegram_api.tl b/td/generate/scheme/telegram_api.tl
index 030aa5d5..5fa86fbb 100644
--- a/td/generate/scheme/telegram_api.tl
+++ b/td/generate/scheme/telegram_api.tl
@@ -172,6 +172,7 @@ photo#9c477dd8 flags:# has_stickers:flags.0?true id:long access_hash:long file_r
 photoSizeEmpty#e17e23c type:string = PhotoSize;
 photoSize#77bfb61b type:string location:FileLocation w:int h:int size:int = PhotoSize;
 photoCachedSize#e9a734fa type:string location:FileLocation w:int h:int bytes:bytes = PhotoSize;
+photoStrippedSize#e0b0bc2e type:string bytes:bytes = PhotoSize;
 
 geoPointEmpty#1117dd5f = GeoPoint;
 geoPoint#296f104 long:double lat:double access_hash:long = GeoPoint;
@@ -230,7 +231,7 @@ messages.dialogsSlice#71e094f3 count:int dialogs:Vector<Dialog> messages:Vector<
 messages.dialogsNotModified#f0e3e596 count:int = messages.Dialogs;
 
 messages.messages#8c718e87 messages:Vector<Message> chats:Vector<Chat> users:Vector<User> = messages.Messages;
-messages.messagesSlice#b446ae3 count:int messages:Vector<Message> chats:Vector<Chat> users:Vector<User> = messages.Messages;
+messages.messagesSlice#a6c47aaa flags:# inexact:flags.1?true count:int messages:Vector<Message> chats:Vector<Chat> users:Vector<User> = messages.Messages;
 messages.channelMessages#99262e37 flags:# inexact:flags.1?true pts:int count:int messages:Vector<Message> chats:Vector<Chat> users:Vector<User> = messages.Messages;
 messages.messagesNotModified#74535f21 count:int = messages.Messages;
 
diff --git a/td/generate/scheme/telegram_api.tlo b/td/generate/scheme/telegram_api.tlo
index 237cc4cd..fa1af615 100644
Binary files a/td/generate/scheme/telegram_api.tlo and b/td/generate/scheme/telegram_api.tlo differ
diff --git a/td/telegram/AnimationsManager.cpp b/td/telegram/AnimationsManager.cpp
index 50883f76..119606e5 100644
--- a/td/telegram/AnimationsManager.cpp
+++ b/td/telegram/AnimationsManager.cpp
@@ -162,6 +162,7 @@ tl_object_ptr<td_api::animation> AnimationsManager::get_animation_object(FileId
   animation->is_changed = false;
   return make_tl_object<td_api::animation>(animation->duration, animation->dimensions.width,
                                            animation->dimensions.height, animation->file_name, animation->mime_type,
+                                           get_minithumbnail_object(animation->minithumbnail),
                                            get_photo_size_object(td_->file_manager_.get(), &animation->thumbnail),
                                            td_->file_manager_->get_file_object(file_id));
 }
@@ -195,6 +196,10 @@ FileId AnimationsManager::on_get_animation(unique_ptr<Animation> new_animation,
       a->duration = new_animation->duration;
       a->is_changed = true;
     }
+    if (a->minithumbnail != new_animation->minithumbnail) {
+      a->minithumbnail = std::move(new_animation->minithumbnail);
+      a->is_changed = true;
+    }
     if (a->thumbnail != new_animation->thumbnail) {
       if (!a->thumbnail.file_id.is_valid()) {
         LOG(DEBUG) << "Animation " << file_id << " thumbnail has changed";
@@ -283,14 +288,15 @@ bool AnimationsManager::merge_animations(FileId new_id, FileId old_id, bool can_
   return true;
 }
 
-void AnimationsManager::create_animation(FileId file_id, PhotoSize thumbnail, string file_name, string mime_type,
-                                         int32 duration, Dimensions dimensions, bool replace) {
+void AnimationsManager::create_animation(FileId file_id, string minithumbnail, PhotoSize thumbnail, string file_name,
+                                         string mime_type, int32 duration, Dimensions dimensions, bool replace) {
   auto a = make_unique<Animation>();
   a->file_id = file_id;
   a->file_name = std::move(file_name);
   a->mime_type = std::move(mime_type);
   a->duration = max(duration, 0);
   a->dimensions = dimensions;
+  a->minithumbnail = std::move(minithumbnail);
   a->thumbnail = std::move(thumbnail);
   on_get_animation(std::move(a), replace);
 }
diff --git a/td/telegram/AnimationsManager.h b/td/telegram/AnimationsManager.h
index d52dc264..102f4409 100644
--- a/td/telegram/AnimationsManager.h
+++ b/td/telegram/AnimationsManager.h
@@ -35,8 +35,8 @@ class AnimationsManager : public Actor {
 
   tl_object_ptr<td_api::animation> get_animation_object(FileId file_id, const char *source);
 
-  void create_animation(FileId file_id, PhotoSize thumbnail, string file_name, string mime_type, int32 duration,
-                        Dimensions dimensions, bool replace);
+  void create_animation(FileId file_id, string minithumbnail, PhotoSize thumbnail, string file_name, string mime_type,
+                        int32 duration, Dimensions dimensions, bool replace);
 
   tl_object_ptr<telegram_api::InputMedia> get_input_media(FileId file_id,
                                                           tl_object_ptr<telegram_api::InputFile> input_file,
@@ -95,6 +95,7 @@ class AnimationsManager : public Actor {
     string mime_type;
     int32 duration = 0;
     Dimensions dimensions;
+    string minithumbnail;
     PhotoSize thumbnail;
 
     FileId file_id;
diff --git a/td/telegram/AnimationsManager.hpp b/td/telegram/AnimationsManager.hpp
index 8ca977bc..204f844e 100644
--- a/td/telegram/AnimationsManager.hpp
+++ b/td/telegram/AnimationsManager.hpp
@@ -26,6 +26,7 @@ void AnimationsManager::store_animation(FileId file_id, StorerT &storer) const {
   store(animation->dimensions, storer);
   store(animation->file_name, storer);
   store(animation->mime_type, storer);
+  store(animation->minithumbnail, storer);
   store(animation->thumbnail, storer);
   store(file_id, storer);
 }
@@ -39,6 +40,9 @@ FileId AnimationsManager::parse_animation(ParserT &parser) {
   parse(animation->dimensions, parser);
   parse(animation->file_name, parser);
   parse(animation->mime_type, parser);
+  if (parser.version() >= static_cast<int32>(Version::SupportMinithumbnails)) {
+    parse(animation->minithumbnail, parser);
+  }
   parse(animation->thumbnail, parser);
   parse(animation->file_id, parser);
   return on_get_animation(std::move(animation), false);
diff --git a/td/telegram/AudiosManager.cpp b/td/telegram/AudiosManager.cpp
index d93a3502..7471436f 100644
--- a/td/telegram/AudiosManager.cpp
+++ b/td/telegram/AudiosManager.cpp
@@ -36,9 +36,10 @@ tl_object_ptr<td_api::audio> AudiosManager::get_audio_object(FileId file_id) {
   auto &audio = audios_[file_id];
   CHECK(audio != nullptr);
   audio->is_changed = false;
-  return make_tl_object<td_api::audio>(
-      audio->duration, audio->title, audio->performer, audio->file_name, audio->mime_type,
-      get_photo_size_object(td_->file_manager_.get(), &audio->thumbnail), td_->file_manager_->get_file_object(file_id));
+  return make_tl_object<td_api::audio>(audio->duration, audio->title, audio->performer, audio->file_name,
+                                       audio->mime_type, get_minithumbnail_object(audio->minithumbnail),
+                                       get_photo_size_object(td_->file_manager_.get(), &audio->thumbnail),
+                                       td_->file_manager_->get_file_object(file_id));
 }
 
 FileId AudiosManager::on_get_audio(unique_ptr<Audio> new_audio, bool replace) {
@@ -66,6 +67,10 @@ FileId AudiosManager::on_get_audio(unique_ptr<Audio> new_audio, bool replace) {
       a->file_name = std::move(new_audio->file_name);
       a->is_changed = true;
     }
+    if (a->minithumbnail != new_audio->minithumbnail) {
+      a->minithumbnail = std::move(new_audio->minithumbnail);
+      a->is_changed = true;
+    }
     if (a->thumbnail != new_audio->thumbnail) {
       if (!a->thumbnail.file_id.is_valid()) {
         LOG(DEBUG) << "Audio " << file_id << " thumbnail has changed";
@@ -163,8 +168,8 @@ void AudiosManager::delete_audio_thumbnail(FileId file_id) {
   audio->thumbnail = PhotoSize();
 }
 
-void AudiosManager::create_audio(FileId file_id, PhotoSize thumbnail, string file_name, string mime_type,
-                                 int32 duration, string title, string performer, bool replace) {
+void AudiosManager::create_audio(FileId file_id, string minithumbnail, PhotoSize thumbnail, string file_name,
+                                 string mime_type, int32 duration, string title, string performer, bool replace) {
   auto a = make_unique<Audio>();
   a->file_id = file_id;
   a->file_name = std::move(file_name);
@@ -172,6 +177,7 @@ void AudiosManager::create_audio(FileId file_id, PhotoSize thumbnail, string fil
   a->duration = max(duration, 0);
   a->title = std::move(title);
   a->performer = std::move(performer);
+  a->minithumbnail = std::move(minithumbnail);
   a->thumbnail = std::move(thumbnail);
   on_get_audio(std::move(a), replace);
 }
diff --git a/td/telegram/AudiosManager.h b/td/telegram/AudiosManager.h
index f6ee0e5a..1c764e67 100644
--- a/td/telegram/AudiosManager.h
+++ b/td/telegram/AudiosManager.h
@@ -30,8 +30,8 @@ class AudiosManager {
 
   tl_object_ptr<td_api::audio> get_audio_object(FileId file_id);
 
-  void create_audio(FileId file_id, PhotoSize thumbnail, string file_name, string mime_type, int32 duration,
-                    string title, string performer, bool replace);
+  void create_audio(FileId file_id, string minithumbnail, PhotoSize thumbnail, string file_name, string mime_type,
+                    int32 duration, string title, string performer, bool replace);
 
   tl_object_ptr<telegram_api::InputMedia> get_input_media(FileId file_id,
                                                           tl_object_ptr<telegram_api::InputFile> input_file,
@@ -65,6 +65,7 @@ class AudiosManager {
     int32 duration = 0;
     string title;
     string performer;
+    string minithumbnail;
     PhotoSize thumbnail;
 
     FileId file_id;
diff --git a/td/telegram/AudiosManager.hpp b/td/telegram/AudiosManager.hpp
index 1159c176..1dc5f259 100644
--- a/td/telegram/AudiosManager.hpp
+++ b/td/telegram/AudiosManager.hpp
@@ -26,6 +26,7 @@ void AudiosManager::store_audio(FileId file_id, StorerT &storer) const {
   store(audio->duration, storer);
   store(audio->title, storer);
   store(audio->performer, storer);
+  store(audio->minithumbnail, storer);
   store(audio->thumbnail, storer);
   store(file_id, storer);
 }
@@ -38,6 +39,9 @@ FileId AudiosManager::parse_audio(ParserT &parser) {
   parse(audio->duration, parser);
   parse(audio->title, parser);
   parse(audio->performer, parser);
+  if (parser.version() >= static_cast<int32>(Version::SupportMinithumbnails)) {
+    parse(audio->minithumbnail, parser);
+  }
   parse(audio->thumbnail, parser);
   parse(audio->file_id, parser);
   return on_get_audio(std::move(audio), false);
diff --git a/td/telegram/DocumentsManager.cpp b/td/telegram/DocumentsManager.cpp
index 7e94f155..99581ca0 100644
--- a/td/telegram/DocumentsManager.cpp
+++ b/td/telegram/DocumentsManager.cpp
@@ -56,6 +56,7 @@ tl_object_ptr<td_api::document> DocumentsManager::get_document_object(FileId fil
   LOG_CHECK(document != nullptr) << tag("file_id", file_id);
   document->is_changed = false;
   return make_tl_object<td_api::document>(document->file_name, document->mime_type,
+                                          get_minithumbnail_object(document->minithumbnail),
                                           get_photo_size_object(td_->file_manager_.get(), &document->thumbnail),
                                           td_->file_manager_->get_file_object(file_id));
 }
@@ -193,6 +194,7 @@ Document DocumentsManager::on_get_document(RemoteDocument remote_document, Dialo
   int32 size;
   string mime_type;
   string file_reference;
+  string minithumbnail;
   PhotoSize thumbnail;
   FileEncryptionKey encryption_key;
   bool is_web = false;
@@ -209,8 +211,13 @@ Document DocumentsManager::on_get_document(RemoteDocument remote_document, Dialo
     file_reference = document->file_reference_.as_slice().str();
 
     if (document_type != Document::Type::VoiceNote) {
-      thumbnail = get_photo_size(td_->file_manager_.get(), FileType::Thumbnail, 0, 0, "", owner_dialog_id,
-                                 std::move(document->thumb_), has_webp_thumbnail);
+      auto photo_size = get_photo_size(td_->file_manager_.get(), FileType::Thumbnail, 0, 0, "", owner_dialog_id,
+                                       std::move(document->thumb_), has_webp_thumbnail);
+      if (photo_size.get_offset() == 0) {
+        thumbnail = std::move(photo_size.get<0>());
+      } else {
+        minithumbnail = std::move(photo_size.get<1>());
+      }
     }
   } else if (remote_document.secret_file != nullptr) {
     CHECK(remote_document.secret_document != nullptr);
@@ -229,8 +236,8 @@ Document DocumentsManager::on_get_document(RemoteDocument remote_document, Dialo
     }
 
     if (document_type != Document::Type::VoiceNote) {
-      thumbnail = get_thumbnail_photo_size(td_->file_manager_.get(), std::move(document->thumb_), owner_dialog_id,
-                                           document->thumb_w_, document->thumb_h_);
+      thumbnail = get_secret_thumbnail_photo_size(td_->file_manager_.get(), std::move(document->thumb_),
+                                                  owner_dialog_id, document->thumb_w_, document->thumb_h_);
     }
   } else {
     is_web = true;
@@ -324,8 +331,9 @@ Document DocumentsManager::on_get_document(RemoteDocument remote_document, Dialo
   switch (document_type) {
     case Document::Type::Animation:
       // TODO use has_stickers
-      td_->animations_manager_->create_animation(file_id, std::move(thumbnail), std::move(file_name),
-                                                 std::move(mime_type), video_duration, dimensions, !is_web);
+      td_->animations_manager_->create_animation(file_id, std::move(minithumbnail), std::move(thumbnail),
+                                                 std::move(file_name), std::move(mime_type), video_duration, dimensions,
+                                                 !is_web);
       break;
     case Document::Type::Audio: {
       int32 duration = 0;
@@ -336,25 +344,27 @@ Document DocumentsManager::on_get_document(RemoteDocument remote_document, Dialo
         title = std::move(audio->title_);
         performer = std::move(audio->performer_);
       }
-      td_->audios_manager_->create_audio(file_id, std::move(thumbnail), std::move(file_name), std::move(mime_type),
-                                         duration, std::move(title), std::move(performer), !is_web);
+      td_->audios_manager_->create_audio(file_id, std::move(minithumbnail), std::move(thumbnail), std::move(file_name),
+                                         std::move(mime_type), duration, std::move(title), std::move(performer),
+                                         !is_web);
       break;
     }
     case Document::Type::General:
-      td_->documents_manager_->create_document(file_id, std::move(thumbnail), std::move(file_name),
-                                               std::move(mime_type), !is_web);
+      create_document(file_id, std::move(minithumbnail), std::move(thumbnail), std::move(file_name),
+                      std::move(mime_type), !is_web);
       break;
     case Document::Type::Sticker:
       td_->stickers_manager_->create_sticker(file_id, std::move(thumbnail), dimensions, true, std::move(sticker),
                                              load_data_multipromise_ptr);
       break;
     case Document::Type::Video:
-      td_->videos_manager_->create_video(file_id, std::move(thumbnail), has_stickers, vector<FileId>(),
-                                         std::move(file_name), std::move(mime_type), video_duration, dimensions,
-                                         supports_streaming, !is_web);
+      td_->videos_manager_->create_video(file_id, std::move(minithumbnail), std::move(thumbnail), has_stickers,
+                                         vector<FileId>(), std::move(file_name), std::move(mime_type), video_duration,
+                                         dimensions, supports_streaming, !is_web);
       break;
     case Document::Type::VideoNote:
-      td_->video_notes_manager_->create_video_note(file_id, std::move(thumbnail), video_duration, dimensions, !is_web);
+      td_->video_notes_manager_->create_video_note(file_id, std::move(minithumbnail), std::move(thumbnail),
+                                                   video_duration, dimensions, !is_web);
       break;
     case Document::Type::VoiceNote: {
       int32 duration = 0;
@@ -392,6 +402,10 @@ FileId DocumentsManager::on_get_document(unique_ptr<GeneralDocument> new_documen
       d->file_name = new_document->file_name;
       d->is_changed = true;
     }
+    if (d->minithumbnail != new_document->minithumbnail) {
+      d->minithumbnail = std::move(new_document->minithumbnail);
+      d->is_changed = true;
+    }
     if (d->thumbnail != new_document->thumbnail) {
       if (!d->thumbnail.file_id.is_valid()) {
         LOG(DEBUG) << "Document " << file_id << " thumbnail has changed";
@@ -407,12 +421,13 @@ FileId DocumentsManager::on_get_document(unique_ptr<GeneralDocument> new_documen
   return file_id;
 }
 
-void DocumentsManager::create_document(FileId file_id, PhotoSize thumbnail, string file_name, string mime_type,
-                                       bool replace) {
+void DocumentsManager::create_document(FileId file_id, string minithumbnail, PhotoSize thumbnail, string file_name,
+                                       string mime_type, bool replace) {
   auto d = make_unique<GeneralDocument>();
   d->file_id = file_id;
   d->file_name = std::move(file_name);
   d->mime_type = std::move(mime_type);
+  d->minithumbnail = std::move(minithumbnail);
   d->thumbnail = std::move(thumbnail);
   on_get_document(std::move(d), replace);
 }
diff --git a/td/telegram/DocumentsManager.h b/td/telegram/DocumentsManager.h
index ec845dbc..78ace1fe 100644
--- a/td/telegram/DocumentsManager.h
+++ b/td/telegram/DocumentsManager.h
@@ -80,7 +80,8 @@ class DocumentsManager {
                            MultiPromiseActor *load_data_multipromise_ptr = nullptr,
                            Document::Type default_document_type = Document::Type::General);
 
-  void create_document(FileId file_id, PhotoSize thumbnail, string file_name, string mime_type, bool replace);
+  void create_document(FileId file_id, string minithumbnail, PhotoSize thumbnail, string file_name, string mime_type,
+                       bool replace);
 
   bool has_input_media(FileId file_id, FileId thumbnail_file_id, bool is_secret) const;
 
@@ -113,6 +114,7 @@ class DocumentsManager {
    public:
     string file_name;
     string mime_type;
+    string minithumbnail;
     PhotoSize thumbnail;
     FileId file_id;
 
diff --git a/td/telegram/DocumentsManager.hpp b/td/telegram/DocumentsManager.hpp
index 45fe9dfd..e1deaeaf 100644
--- a/td/telegram/DocumentsManager.hpp
+++ b/td/telegram/DocumentsManager.hpp
@@ -24,6 +24,7 @@ void DocumentsManager::store_document(FileId file_id, StorerT &storer) const {
   const GeneralDocument *document = it->second.get();
   store(document->file_name, storer);
   store(document->mime_type, storer);
+  store(document->minithumbnail, storer);
   store(document->thumbnail, storer);
   store(file_id, storer);
 }
@@ -33,6 +34,9 @@ FileId DocumentsManager::parse_document(ParserT &parser) {
   auto document = make_unique<GeneralDocument>();
   parse(document->file_name, parser);
   parse(document->mime_type, parser);
+  if (parser.version() >= static_cast<int32>(Version::SupportMinithumbnails)) {
+    parse(document->minithumbnail, parser);
+  }
   parse(document->thumbnail, parser);
   parse(document->file_id, parser);
   LOG(DEBUG) << "Parsed document " << document->file_id;
diff --git a/td/telegram/InlineQueriesManager.cpp b/td/telegram/InlineQueriesManager.cpp
index d9c7b956..8f7f23d5 100644
--- a/td/telegram/InlineQueriesManager.cpp
+++ b/td/telegram/InlineQueriesManager.cpp
@@ -851,6 +851,11 @@ td_api::object_ptr<td_api::file> copy(const td_api::file &obj) {
   }
 }
 
+template <>
+tl_object_ptr<td_api::minithumbnail> copy(const td_api::minithumbnail &obj) {
+  return make_tl_object<td_api::minithumbnail>(obj.width_, obj.height_, obj.data_);
+}
+
 template <>
 tl_object_ptr<td_api::photoSize> copy(const td_api::photoSize &obj) {
   return make_tl_object<td_api::photoSize>(obj.type_, copy(obj.photo_), obj.width_, obj.height_);
@@ -885,23 +890,26 @@ tl_object_ptr<td_api::maskPosition> copy(const td_api::maskPosition &obj) {
 template <>
 tl_object_ptr<td_api::animation> copy(const td_api::animation &obj) {
   return make_tl_object<td_api::animation>(obj.duration_, obj.width_, obj.height_, obj.file_name_, obj.mime_type_,
-                                           copy(obj.thumbnail_), copy(obj.animation_));
+                                           copy(obj.minithumbnail_), copy(obj.thumbnail_), copy(obj.animation_));
 }
 
 template <>
 tl_object_ptr<td_api::audio> copy(const td_api::audio &obj) {
   return make_tl_object<td_api::audio>(obj.duration_, obj.title_, obj.performer_, obj.file_name_, obj.mime_type_,
-                                       copy(obj.album_cover_thumbnail_), copy(obj.audio_));
+                                       copy(obj.album_cover_minithumbnail_), copy(obj.album_cover_thumbnail_),
+                                       copy(obj.audio_));
 }
 
 template <>
 tl_object_ptr<td_api::document> copy(const td_api::document &obj) {
-  return make_tl_object<td_api::document>(obj.file_name_, obj.mime_type_, copy(obj.thumbnail_), copy(obj.document_));
+  return make_tl_object<td_api::document>(obj.file_name_, obj.mime_type_, copy(obj.minithumbnail_),
+                                          copy(obj.thumbnail_), copy(obj.document_));
 }
 
 template <>
 tl_object_ptr<td_api::photo> copy(const td_api::photo &obj) {
-  return make_tl_object<td_api::photo>(obj.has_stickers_, transform(obj.sizes_, copy_photo_size));
+  return make_tl_object<td_api::photo>(obj.has_stickers_, copy(obj.minithumbnail_),
+                                       transform(obj.sizes_, copy_photo_size));
 }
 
 template <>
@@ -913,8 +921,8 @@ tl_object_ptr<td_api::sticker> copy(const td_api::sticker &obj) {
 template <>
 tl_object_ptr<td_api::video> copy(const td_api::video &obj) {
   return make_tl_object<td_api::video>(obj.duration_, obj.width_, obj.height_, obj.file_name_, obj.mime_type_,
-                                       obj.has_stickers_, obj.supports_streaming_, copy(obj.thumbnail_),
-                                       copy(obj.video_));
+                                       obj.has_stickers_, obj.supports_streaming_, copy(obj.minithumbnail_),
+                                       copy(obj.thumbnail_), copy(obj.video_));
 }
 
 template <>
diff --git a/td/telegram/MessageContent.cpp b/td/telegram/MessageContent.cpp
index 46925aed..be0c1ba3 100644
--- a/td/telegram/MessageContent.cpp
+++ b/td/telegram/MessageContent.cpp
@@ -1499,7 +1499,7 @@ static Result<InputMessageContent> create_input_message_content(
       auto input_animation = static_cast<td_api::inputMessageAnimation *>(input_message_content.get());
 
       td->animations_manager_->create_animation(
-          file_id, thumbnail, std::move(file_name), std::move(mime_type), input_animation->duration_,
+          file_id, string(), thumbnail, std::move(file_name), std::move(mime_type), input_animation->duration_,
           get_dimensions(input_animation->width_, input_animation->height_), false);
 
       content = make_unique<MessageAnimation>(file_id, std::move(caption));
@@ -1515,7 +1515,7 @@ static Result<InputMessageContent> create_input_message_content(
         return Status::Error(400, "Audio performer must be encoded in UTF-8");
       }
 
-      td->audios_manager_->create_audio(file_id, thumbnail, std::move(file_name), std::move(mime_type),
+      td->audios_manager_->create_audio(file_id, string(), thumbnail, std::move(file_name), std::move(mime_type),
                                         input_audio->duration_, std::move(input_audio->title_),
                                         std::move(input_audio->performer_), false);
 
@@ -1523,7 +1523,8 @@ static Result<InputMessageContent> create_input_message_content(
       break;
     }
     case td_api::inputMessageDocument::ID:
-      td->documents_manager_->create_document(file_id, thumbnail, std::move(file_name), std::move(mime_type), false);
+      td->documents_manager_->create_document(file_id, string(), thumbnail, std::move(file_name), std::move(mime_type),
+                                              false);
 
       content = make_unique<MessageDocument>(file_id, std::move(caption));
       break;
@@ -1579,7 +1580,7 @@ static Result<InputMessageContent> create_input_message_content(
       ttl = input_video->ttl_;
 
       bool has_stickers = !sticker_file_ids.empty();
-      td->videos_manager_->create_video(file_id, thumbnail, has_stickers, std::move(sticker_file_ids),
+      td->videos_manager_->create_video(file_id, string(), thumbnail, has_stickers, std::move(sticker_file_ids),
                                         std::move(file_name), std::move(mime_type), input_video->duration_,
                                         get_dimensions(input_video->width_, input_video->height_),
                                         input_video->supports_streaming_, false);
@@ -1595,7 +1596,7 @@ static Result<InputMessageContent> create_input_message_content(
         return Status::Error(400, "Wrong video note length");
       }
 
-      td->video_notes_manager_->create_video_note(file_id, thumbnail, input_video_note->duration_,
+      td->video_notes_manager_->create_video_note(file_id, string(), thumbnail, input_video_note->duration_,
                                                   get_dimensions(length, length), false);
 
       content = make_unique<MessageVideoNote>(file_id, false);
@@ -2869,6 +2870,9 @@ void merge_message_contents(Td *td, const MessageContent *old_content, MessageCo
       if (old_photo->id != new_photo->id || old_->caption != new_->caption) {
         need_update = true;
       }
+      if (old_photo->minithumbnail != new_photo->minithumbnail) {
+        need_update = true;
+      }
       if (old_photo->photos != new_photo->photos) {
         if (need_merge_files &&
             (old_photo->photos.size() == 1 || (old_photo->photos.size() == 2 && old_photo->photos[0].type == 't')) &&
diff --git a/td/telegram/Photo.cpp b/td/telegram/Photo.cpp
index efc8daba..261066aa 100644
--- a/td/telegram/Photo.cpp
+++ b/td/telegram/Photo.cpp
@@ -14,6 +14,7 @@
 #include "td/telegram/files/FileManager.h"
 #include "td/telegram/net/DcId.h"
 
+#include "td/utils/base64.h"
 #include "td/utils/common.h"
 #include "td/utils/format.h"
 #include "td/utils/HttpUrl.h"
@@ -61,6 +62,39 @@ StringBuilder &operator<<(StringBuilder &string_builder, const Dimensions &dimen
   return string_builder << "(" << dimensions.width << ", " << dimensions.height << ")";
 }
 
+td_api::object_ptr<td_api::minithumbnail> get_minithumbnail_object(const string &packed) {
+  if (packed.size() < 3) {
+    return nullptr;
+  }
+  if (packed[0] == '\x01') {
+    static const string header =
+        base64_decode(
+            "/9j/4AAQSkZJRgABAQAAAQABAAD/2wBDACgcHiMeGSgjISMtKygwPGRBPDc3PHtYXUlkkYCZlo+AjIqgtObDoKrarYqMyP/L2u71////"
+            "m8H///"
+            "/6/+b9//j/2wBDASstLTw1PHZBQXb4pYyl+Pj4+Pj4+Pj4+Pj4+Pj4+Pj4+Pj4+Pj4+Pj4+Pj4+Pj4+Pj4+Pj4+Pj4+Pj4+Pj4+Pj/"
+            "wAARCAAAAAADASIAAhEBAxEB/8QAHwAAAQUBAQEBAQEAAAAAAAAAAAECAwQFBgcICQoL/"
+            "8QAtRAAAgEDAwIEAwUFBAQAAAF9AQIDAAQRBRIhMUEGE1FhByJxFDKBkaEII0KxwRVS0fAkM2JyggkKFhcYGRolJicoKSo0NTY3ODk6Q0R"
+            "FRkd"
+            "ISUpTVFVWV1hZWmNkZWZnaGlqc3R1dnd4eXqDhIWGh4iJipKTlJWWl5iZmqKjpKWmp6ipqrKztLW2t7i5usLDxMXGx8jJytLT1NXW19jZ2"
+            "uHi4"
+            "+Tl5ufo6erx8vP09fb3+Pn6/8QAHwEAAwEBAQEBAQEBAQAAAAAAAAECAwQFBgcICQoL/"
+            "8QAtREAAgECBAQDBAcFBAQAAQJ3AAECAxEEBSExBhJBUQdhcRMiMoEIFEKRobHBCSMzUvAVYnLRChYkNOEl8RcYGRomJygpKjU2Nzg5OkN"
+            "ERUZ"
+            "HSElKU1RVVldYWVpjZGVmZ2hpanN0dXZ3eHl6goOEhYaHiImKkpOUlZaXmJmaoqOkpaanqKmqsrO0tba3uLm6wsPExcbHyMnK0tPU1dbX2"
+            "Nna4"
+            "uPk5ebn6Onq8vP09fb3+Pn6/9oADAMBAAIRAxEAPwA=")
+            .move_as_ok();
+    static const string footer = base64_decode("/9k=").move_as_ok();
+    auto result = td_api::make_object<td_api::minithumbnail>();
+    result->width_ = static_cast<unsigned char>(packed[1]);
+    result->height_ = static_cast<unsigned char>(packed[2]);
+    result->data_ = PSTRING() << header.substr(0, 164) << packed[1] << header[165] << packed[2] << header.substr(167)
+                              << packed.substr(3) << footer;
+    return result;
+  }
+  return nullptr;
+}
+
 static FileId register_photo(FileManager *file_manager, FileType file_type, int64 id, int64 access_hash,
                              std::string upload_file_reference,
                              tl_object_ptr<telegram_api::FileLocation> &&location_ptr, DialogId owner_dialog_id,
@@ -228,8 +262,8 @@ StringBuilder &operator<<(StringBuilder &string_builder, const DialogPhoto &dial
                         << ", big_file_id = " << dialog_photo.big_file_id << ">";
 }
 
-PhotoSize get_thumbnail_photo_size(FileManager *file_manager, BufferSlice bytes, DialogId owner_dialog_id, int32 width,
-                                   int32 height) {
+PhotoSize get_secret_thumbnail_photo_size(FileManager *file_manager, BufferSlice bytes, DialogId owner_dialog_id,
+                                          int32 width, int32 height) {
   if (bytes.empty()) {
     return PhotoSize();
   }
@@ -252,9 +286,9 @@ PhotoSize get_thumbnail_photo_size(FileManager *file_manager, BufferSlice bytes,
   return res;
 }
 
-PhotoSize get_photo_size(FileManager *file_manager, FileType file_type, int64 id, int64 access_hash,
-                         std::string upload_file_reference, DialogId owner_dialog_id,
-                         tl_object_ptr<telegram_api::PhotoSize> &&size_ptr, bool is_webp) {
+Variant<PhotoSize, string> get_photo_size(FileManager *file_manager, FileType file_type, int64 id, int64 access_hash,
+                                          std::string upload_file_reference, DialogId owner_dialog_id,
+                                          tl_object_ptr<telegram_api::PhotoSize> &&size_ptr, bool is_webp) {
   tl_object_ptr<telegram_api::FileLocation> location_ptr;
   string type;
 
@@ -263,7 +297,7 @@ PhotoSize get_photo_size(FileManager *file_manager, FileType file_type, int64 id
 
   switch (size_ptr->get_id()) {
     case telegram_api::photoSizeEmpty::ID:
-      return res;
+      return std::move(res);
     case telegram_api::photoSize::ID: {
       auto size = move_tl_object_as<telegram_api::photoSize>(size_ptr);
 
@@ -287,6 +321,10 @@ PhotoSize get_photo_size(FileManager *file_manager, FileType file_type, int64 id
 
       break;
     }
+    case telegram_api::photoStrippedSize::ID: {
+      auto size = move_tl_object_as<telegram_api::photoStrippedSize>(size_ptr);
+      return size->bytes_.as_slice().str();
+    }
     default:
       UNREACHABLE();
       break;
@@ -306,7 +344,7 @@ PhotoSize get_photo_size(FileManager *file_manager, FileType file_type, int64 id
     res.type = static_cast<int32>(type[0]);
   }
 
-  return res;
+  return std::move(res);
 }
 
 PhotoSize get_web_document_photo_size(FileManager *file_manager, FileType file_type, DialogId owner_dialog_id,
@@ -465,8 +503,8 @@ Photo get_photo(FileManager *file_manager, tl_object_ptr<telegram_api::encrypted
   res.date = 0;
 
   if (!photo->thumb_.empty()) {
-    res.photos.push_back(get_thumbnail_photo_size(file_manager, std::move(photo->thumb_), owner_dialog_id,
-                                                  photo->thumb_w_, photo->thumb_h_));
+    res.photos.push_back(get_secret_thumbnail_photo_size(file_manager, std::move(photo->thumb_), owner_dialog_id,
+                                                         photo->thumb_w_, photo->thumb_h_));
   }
 
   PhotoSize s;
@@ -487,9 +525,14 @@ Photo get_photo(FileManager *file_manager, tl_object_ptr<telegram_api::photo> &&
   res.has_stickers = (photo->flags_ & telegram_api::photo::HAS_STICKERS_MASK) != 0;
 
   for (auto &size_ptr : photo->sizes_) {
-    res.photos.push_back(get_photo_size(file_manager, FileType::Photo, photo->id_, photo->access_hash_,
-                                        photo->file_reference_.as_slice().str(), owner_dialog_id, std::move(size_ptr),
-                                        false));
+    auto photo_size =
+        get_photo_size(file_manager, FileType::Photo, photo->id_, photo->access_hash_,
+                       photo->file_reference_.as_slice().str(), owner_dialog_id, std::move(size_ptr), false);
+    if (photo_size.get_offset() == 0) {
+      res.photos.push_back(std::move(photo_size.get<0>()));
+    } else {
+      res.minithumbnail = std::move(photo_size.get<1>());
+    }
   }
 
   return res;
@@ -513,7 +556,8 @@ tl_object_ptr<td_api::photo> get_photo_object(FileManager *file_manager, const P
     return nullptr;
   }
 
-  return td_api::make_object<td_api::photo>(photo->has_stickers, get_photo_sizes_object(file_manager, photo->photos));
+  return td_api::make_object<td_api::photo>(photo->has_stickers, get_minithumbnail_object(photo->minithumbnail),
+                                            get_photo_sizes_object(file_manager, photo->photos));
 }
 
 tl_object_ptr<td_api::userProfilePhoto> get_user_profile_photo_object(FileManager *file_manager, const Photo *photo) {
@@ -718,6 +762,8 @@ tl_object_ptr<telegram_api::userProfilePhoto> convert_photo_to_profile_photo(
         }
         break;
       }
+      case telegram_api::photoStrippedSize::ID:
+        break;
       default:
         UNREACHABLE();
         break;
diff --git a/td/telegram/Photo.h b/td/telegram/Photo.h
index 296f53a7..644904b6 100644
--- a/td/telegram/Photo.h
+++ b/td/telegram/Photo.h
@@ -11,14 +11,15 @@
 #include "td/telegram/files/FileType.h"
 #include "td/telegram/SecretInputMedia.h"
 
-#include "td/utils/buffer.h"
-#include "td/utils/common.h"
-#include "td/utils/StringBuilder.h"
-
 #include "td/telegram/secret_api.h"
 #include "td/telegram/td_api.h"
 #include "td/telegram/telegram_api.h"
 
+#include "td/utils/buffer.h"
+#include "td/utils/common.h"
+#include "td/utils/StringBuilder.h"
+#include "td/utils/Variant.h"
+
 namespace td {
 
 class FileManager;
@@ -47,6 +48,7 @@ struct PhotoSize {
 struct Photo {
   int64 id = 0;
   int32 date = 0;
+  string minithumbnail;
   vector<PhotoSize> photos;
 
   bool has_stickers = false;
@@ -60,6 +62,8 @@ bool operator!=(const Dimensions &lhs, const Dimensions &rhs);
 
 StringBuilder &operator<<(StringBuilder &string_builder, const Dimensions &dimensions);
 
+td_api::object_ptr<td_api::minithumbnail> get_minithumbnail_object(const string &packed);
+
 ProfilePhoto get_profile_photo(FileManager *file_manager,
                                tl_object_ptr<telegram_api::UserProfilePhoto> &&profile_photo_ptr);
 tl_object_ptr<td_api::profilePhoto> get_profile_photo_object(FileManager *file_manager,
@@ -80,11 +84,11 @@ bool operator!=(const DialogPhoto &lhs, const DialogPhoto &rhs);
 
 StringBuilder &operator<<(StringBuilder &string_builder, const DialogPhoto &dialog_photo);
 
-PhotoSize get_thumbnail_photo_size(FileManager *file_manager, BufferSlice bytes, DialogId owner_dialog_id, int32 width,
-                                   int32 height);
-PhotoSize get_photo_size(FileManager *file_manager, FileType file_type, int64 id, int64 access_hash,
-                         std::string upload_file_reference, DialogId owner_dialog_id,
-                         tl_object_ptr<telegram_api::PhotoSize> &&size_ptr, bool is_webp);
+PhotoSize get_secret_thumbnail_photo_size(FileManager *file_manager, BufferSlice bytes, DialogId owner_dialog_id,
+                                          int32 width, int32 height);
+Variant<PhotoSize, string> get_photo_size(FileManager *file_manager, FileType file_type, int64 id, int64 access_hash,
+                                          std::string upload_file_reference, DialogId owner_dialog_id,
+                                          tl_object_ptr<telegram_api::PhotoSize> &&size_ptr, bool is_webp);
 PhotoSize get_web_document_photo_size(FileManager *file_manager, FileType file_type, DialogId owner_dialog_id,
                                       tl_object_ptr<telegram_api::WebDocument> web_document_ptr);
 td_api::object_ptr<td_api::photoSize> get_photo_size_object(FileManager *file_manager, const PhotoSize *photo_size);
diff --git a/td/telegram/Photo.hpp b/td/telegram/Photo.hpp
index 7014e754..0c683c9c 100644
--- a/td/telegram/Photo.hpp
+++ b/td/telegram/Photo.hpp
@@ -72,8 +72,10 @@ void parse(PhotoSize &photo_size, ParserT &parser) {
 
 template <class StorerT>
 void store(const Photo &photo, StorerT &storer) {
+  bool has_minithumbnail = !photo.minithumbnail.empty();
   BEGIN_STORE_FLAGS();
   STORE_FLAG(photo.has_stickers);
+  STORE_FLAG(has_minithumbnail);
   END_STORE_FLAGS();
   store(photo.id, storer);
   store(photo.date, storer);
@@ -81,12 +83,17 @@ void store(const Photo &photo, StorerT &storer) {
   if (photo.has_stickers) {
     store(photo.sticker_file_ids, storer);
   }
+  if (has_minithumbnail) {
+    store(photo.minithumbnail, storer);
+  }
 }
 
 template <class ParserT>
 void parse(Photo &photo, ParserT &parser) {
+  bool has_minithumbnail;
   BEGIN_PARSE_FLAGS();
   PARSE_FLAG(photo.has_stickers);
+  PARSE_FLAG(has_minithumbnail);
   END_PARSE_FLAGS();
   parse(photo.id, parser);
   parse(photo.date, parser);
@@ -94,6 +101,9 @@ void parse(Photo &photo, ParserT &parser) {
   if (photo.has_stickers) {
     parse(photo.sticker_file_ids, parser);
   }
+  if (has_minithumbnail) {
+    parse(photo.minithumbnail, parser);
+  }
 }
 
 }  // namespace td
diff --git a/td/telegram/StickersManager.cpp b/td/telegram/StickersManager.cpp
index 2656bef7..6ae86596 100644
--- a/td/telegram/StickersManager.cpp
+++ b/td/telegram/StickersManager.cpp
@@ -1165,8 +1165,14 @@ std::pair<int64, FileId> StickersManager::on_get_sticker_document(tl_object_ptr<
                              document->file_reference_.as_slice().str()),
       FileLocationSource::FromServer, DialogId(), document->size_, 0, PSTRING() << document_id << ".webp");
 
-  PhotoSize thumbnail = get_photo_size(td_->file_manager_.get(), FileType::Thumbnail, 0, 0, "", DialogId(),
-                                       std::move(document->thumb_), has_webp_thumbnail(sticker));
+  auto photo_size = get_photo_size(td_->file_manager_.get(), FileType::Thumbnail, 0, 0, "", DialogId(),
+                                   std::move(document->thumb_), has_webp_thumbnail(sticker));
+  PhotoSize thumbnail;
+  if (photo_size.get_offset() == 0) {
+    thumbnail = std::move(photo_size.get<0>());
+  } else {
+    LOG(ERROR) << "Receive minithumbnail for a sticker";
+  }
 
   create_sticker(sticker_id, std::move(thumbnail), dimensions, from_message, std::move(sticker), nullptr);
   return {document_id, sticker_id};
@@ -3220,7 +3226,7 @@ Result<std::tuple<FileId, bool, bool>> StickersManager::prepare_input_file(
   }
   auto file_id = r_file_id.move_as_ok();
 
-  td_->documents_manager_->create_document(file_id, PhotoSize(), "sticker.png", "image/png", false);
+  td_->documents_manager_->create_document(file_id, string(), PhotoSize(), "sticker.png", "image/png", false);
 
   FileView file_view = td_->file_manager_->get_file_view(file_id);
   if (file_view.is_encrypted()) {
diff --git a/td/telegram/Version.h b/td/telegram/Version.h
index 14890c6b..b2e7abbb 100644
--- a/td/telegram/Version.h
+++ b/td/telegram/Version.h
@@ -29,6 +29,7 @@ enum class Version : int32 {
   AddMessageUnsupportedVersion,
   SupportInstantView2_0,
   AddNotificationGroupInfoMaxRemovedMessageId,
+  SupportMinithumbnails,
   Next
 };
 
diff --git a/td/telegram/VideoNotesManager.cpp b/td/telegram/VideoNotesManager.cpp
index 1f0dff63..af4ad21b 100644
--- a/td/telegram/VideoNotesManager.cpp
+++ b/td/telegram/VideoNotesManager.cpp
@@ -39,6 +39,7 @@ tl_object_ptr<td_api::videoNote> VideoNotesManager::get_video_note_object(FileId
   video_note->is_changed = false;
 
   return make_tl_object<td_api::videoNote>(video_note->duration, video_note->dimensions.width,
+                                           get_minithumbnail_object(video_note->minithumbnail),
                                            get_photo_size_object(td_->file_manager_.get(), &video_note->thumbnail),
                                            td_->file_manager_->get_file_object(file_id));
 }
@@ -57,6 +58,10 @@ FileId VideoNotesManager::on_get_video_note(unique_ptr<VideoNote> new_video_note
       v->dimensions = new_video_note->dimensions;
       v->is_changed = true;
     }
+    if (v->minithumbnail != new_video_note->minithumbnail) {
+      v->minithumbnail = std::move(new_video_note->minithumbnail);
+      v->is_changed = true;
+    }
     if (v->thumbnail != new_video_note->thumbnail) {
       if (!v->thumbnail.file_id.is_valid()) {
         LOG(DEBUG) << "Video note " << file_id << " thumbnail has changed";
@@ -142,8 +147,8 @@ bool VideoNotesManager::merge_video_notes(FileId new_id, FileId old_id, bool can
   return true;
 }
 
-void VideoNotesManager::create_video_note(FileId file_id, PhotoSize thumbnail, int32 duration, Dimensions dimensions,
-                                          bool replace) {
+void VideoNotesManager::create_video_note(FileId file_id, string minithumbnail, PhotoSize thumbnail, int32 duration,
+                                          Dimensions dimensions, bool replace) {
   auto v = make_unique<VideoNote>();
   v->file_id = file_id;
   v->duration = max(duration, 0);
@@ -152,6 +157,7 @@ void VideoNotesManager::create_video_note(FileId file_id, PhotoSize thumbnail, i
   } else {
     LOG(INFO) << "Receive wrong video note dimensions " << dimensions;
   }
+  v->minithumbnail = std::move(minithumbnail);
   v->thumbnail = std::move(thumbnail);
   on_get_video_note(std::move(v), replace);
 }
diff --git a/td/telegram/VideoNotesManager.h b/td/telegram/VideoNotesManager.h
index 75ed5f33..0933d480 100644
--- a/td/telegram/VideoNotesManager.h
+++ b/td/telegram/VideoNotesManager.h
@@ -30,7 +30,8 @@ class VideoNotesManager {
 
   tl_object_ptr<td_api::videoNote> get_video_note_object(FileId file_id);
 
-  void create_video_note(FileId file_id, PhotoSize thumbnail, int32 duration, Dimensions dimensions, bool replace);
+  void create_video_note(FileId file_id, string minithumbnail, PhotoSize thumbnail, int32 duration,
+                         Dimensions dimensions, bool replace);
 
   tl_object_ptr<telegram_api::InputMedia> get_input_media(FileId file_id,
                                                           tl_object_ptr<telegram_api::InputFile> input_file,
@@ -59,6 +60,7 @@ class VideoNotesManager {
    public:
     int32 duration = 0;
     Dimensions dimensions;
+    string minithumbnail;
     PhotoSize thumbnail;
 
     FileId file_id;
diff --git a/td/telegram/VideoNotesManager.hpp b/td/telegram/VideoNotesManager.hpp
index dbf39981..e3edfb8f 100644
--- a/td/telegram/VideoNotesManager.hpp
+++ b/td/telegram/VideoNotesManager.hpp
@@ -23,6 +23,7 @@ void VideoNotesManager::store_video_note(FileId file_id, StorerT &storer) const
   const VideoNote *video_note = it->second.get();
   store(video_note->duration, storer);
   store(video_note->dimensions, storer);
+  store(video_note->minithumbnail, storer);
   store(video_note->thumbnail, storer);
   store(file_id, storer);
 }
@@ -32,6 +33,9 @@ FileId VideoNotesManager::parse_video_note(ParserT &parser) {
   auto video_note = make_unique<VideoNote>();
   parse(video_note->duration, parser);
   parse(video_note->dimensions, parser);
+  if (parser.version() >= static_cast<int32>(Version::SupportMinithumbnails)) {
+    parse(video_note->minithumbnail, parser);
+  }
   parse(video_note->thumbnail, parser);
   parse(video_note->file_id, parser);
   return on_get_video_note(std::move(video_note), false);
diff --git a/td/telegram/VideosManager.cpp b/td/telegram/VideosManager.cpp
index f99f5502..ae705369 100644
--- a/td/telegram/VideosManager.cpp
+++ b/td/telegram/VideosManager.cpp
@@ -40,7 +40,7 @@ tl_object_ptr<td_api::video> VideosManager::get_video_object(FileId file_id) {
 
   return make_tl_object<td_api::video>(
       video->duration, video->dimensions.width, video->dimensions.height, video->file_name, video->mime_type,
-      video->has_stickers, video->supports_streaming,
+      video->has_stickers, video->supports_streaming, get_minithumbnail_object(video->minithumbnail),
       get_photo_size_object(td_->file_manager_.get(), &video->thumbnail), td_->file_manager_->get_file_object(file_id));
 }
 
@@ -70,6 +70,10 @@ FileId VideosManager::on_get_video(unique_ptr<Video> new_video, bool replace) {
       v->file_name = std::move(new_video->file_name);
       v->is_changed = true;
     }
+    if (v->minithumbnail != new_video->minithumbnail) {
+      v->minithumbnail = std::move(new_video->minithumbnail);
+      v->is_changed = true;
+    }
     if (v->thumbnail != new_video->thumbnail) {
       if (!v->thumbnail.file_id.is_valid()) {
         LOG(DEBUG) << "Video " << file_id << " thumbnail has changed";
@@ -168,7 +172,7 @@ bool VideosManager::merge_videos(FileId new_id, FileId old_id, bool can_delete_o
   return true;
 }
 
-void VideosManager::create_video(FileId file_id, PhotoSize thumbnail, bool has_stickers,
+void VideosManager::create_video(FileId file_id, string minithumbnail, PhotoSize thumbnail, bool has_stickers,
                                  vector<FileId> &&sticker_file_ids, string file_name, string mime_type, int32 duration,
                                  Dimensions dimensions, bool supports_streaming, bool replace) {
   auto v = make_unique<Video>();
@@ -177,6 +181,7 @@ void VideosManager::create_video(FileId file_id, PhotoSize thumbnail, bool has_s
   v->mime_type = std::move(mime_type);
   v->duration = max(duration, 0);
   v->dimensions = dimensions;
+  v->minithumbnail = std::move(minithumbnail);
   v->thumbnail = std::move(thumbnail);
   v->supports_streaming = supports_streaming;
   v->has_stickers = has_stickers;
diff --git a/td/telegram/VideosManager.h b/td/telegram/VideosManager.h
index 1243d374..75d0dacb 100644
--- a/td/telegram/VideosManager.h
+++ b/td/telegram/VideosManager.h
@@ -30,9 +30,9 @@ class VideosManager {
 
   tl_object_ptr<td_api::video> get_video_object(FileId file_id);
 
-  void create_video(FileId file_id, PhotoSize thumbnail, bool has_stickers, vector<FileId> &&sticker_file_ids,
-                    string file_name, string mime_type, int32 duration, Dimensions dimensions, bool supports_streaming,
-                    bool replace);
+  void create_video(FileId file_id, string minithumbnail, PhotoSize thumbnail, bool has_stickers,
+                    vector<FileId> &&sticker_file_ids, string file_name, string mime_type, int32 duration,
+                    Dimensions dimensions, bool supports_streaming, bool replace);
 
   tl_object_ptr<telegram_api::InputMedia> get_input_media(FileId file_id,
                                                           tl_object_ptr<telegram_api::InputFile> input_file,
@@ -66,6 +66,7 @@ class VideosManager {
     string mime_type;
     int32 duration = 0;
     Dimensions dimensions;
+    string minithumbnail;
     PhotoSize thumbnail;
 
     bool supports_streaming = false;
diff --git a/td/telegram/VideosManager.hpp b/td/telegram/VideosManager.hpp
index e48adf62..50c15e04 100644
--- a/td/telegram/VideosManager.hpp
+++ b/td/telegram/VideosManager.hpp
@@ -29,6 +29,7 @@ void VideosManager::store_video(FileId file_id, StorerT &storer) const {
   store(video->mime_type, storer);
   store(video->duration, storer);
   store(video->dimensions, storer);
+  store(video->minithumbnail, storer);
   store(video->thumbnail, storer);
   store(file_id, storer);
   if (video->has_stickers) {
@@ -47,6 +48,9 @@ FileId VideosManager::parse_video(ParserT &parser) {
   parse(video->mime_type, parser);
   parse(video->duration, parser);
   parse(video->dimensions, parser);
+  if (parser.version() >= static_cast<int32>(Version::SupportMinithumbnails)) {
+    parse(video->minithumbnail, parser);
+  }
   parse(video->thumbnail, parser);
   parse(video->file_id, parser);
   if (video->has_stickers) {
diff --git a/td/telegram/WallpaperManager.cpp b/td/telegram/WallpaperManager.cpp
index 089488a6..c1ae6798 100644
--- a/td/telegram/WallpaperManager.cpp
+++ b/td/telegram/WallpaperManager.cpp
@@ -97,11 +97,17 @@ void WallpaperManager::on_get_wallpapers(Result<vector<telegram_api::object_ptr<
     switch (wallpaper_ptr->get_id()) {
       case telegram_api::wallPaper::ID: {
         auto wallpaper = move_tl_object_as<telegram_api::wallPaper>(wallpaper_ptr);
-        vector<PhotoSize> sizes = transform(std::move(wallpaper->sizes_),
-                                            [file_manager](tl_object_ptr<telegram_api::PhotoSize> &&photo_size) {
-                                              return get_photo_size(file_manager, FileType::Wallpaper, 0, 0, "",
-                                                                    DialogId(), std::move(photo_size), false);
-                                            });
+        vector<PhotoSize> sizes;
+        sizes.reserve(wallpaper->sizes_.size());
+        for (auto &size : wallpaper->sizes_) {
+          auto photo_size =
+              get_photo_size(file_manager, FileType::Wallpaper, 0, 0, "", DialogId(), std::move(size), false);
+          if (photo_size.get_offset() == 0) {
+            sizes.push_back(std::move(photo_size.get<0>()));
+          } else {
+            LOG(ERROR) << "Receive minithumbnail for a wallpaper";
+          }
+        }
         return Wallpaper{wallpaper->id_, std::move(sizes), wallpaper->color_};
       }
       case telegram_api::wallPaperSolid::ID: {
diff --git a/td/telegram/net/MtprotoHeader.cpp b/td/telegram/net/MtprotoHeader.cpp
index cf769cee..7bc83d4b 100644
--- a/td/telegram/net/MtprotoHeader.cpp
+++ b/td/telegram/net/MtprotoHeader.cpp
@@ -21,7 +21,7 @@ class HeaderStorer {
   }
   template <class StorerT>
   void store(StorerT &storer) const {
-    constexpr int32 LAYER = 91;
+    constexpr int32 LAYER = 92;
 
     using td::store;
     // invokeWithLayer#da9b0d0d {X:Type} layer:int query:!X = X;