diff --git a/td/telegram/AnimationsManager.cpp b/td/telegram/AnimationsManager.cpp
index feb031f94..91c7547ff 100644
--- a/td/telegram/AnimationsManager.cpp
+++ b/td/telegram/AnimationsManager.cpp
@@ -129,6 +129,7 @@ tl_object_ptr<td_api::animation> AnimationsManager::get_animation_object(FileId
 
 FileId AnimationsManager::on_get_animation(std::unique_ptr<Animation> new_animation, bool replace) {
   auto file_id = new_animation->file_id;
+  LOG(INFO) << "Receive animation " << file_id;
   auto &a = animations_[file_id];
   if (a == nullptr) {
     a = std::move(new_animation);
@@ -207,6 +208,8 @@ bool AnimationsManager::merge_animations(FileId new_id, FileId old_id, bool can_
     LOG(ERROR) << "Old file id is invalid";
     return true;
   }
+
+  LOG(INFO) << "Merge animations " << new_id << " and " << old_id;
   const Animation *old_ = get_animation(old_id);
   CHECK(old_ != nullptr);
   if (old_id == new_id) {
diff --git a/td/telegram/AudiosManager.cpp b/td/telegram/AudiosManager.cpp
index 737317408..d539bb8da 100644
--- a/td/telegram/AudiosManager.cpp
+++ b/td/telegram/AudiosManager.cpp
@@ -50,6 +50,7 @@ tl_object_ptr<td_api::audio> AudiosManager::get_audio_object(FileId file_id) {
 
 FileId AudiosManager::on_get_audio(std::unique_ptr<Audio> new_audio, bool replace) {
   auto file_id = new_audio->file_id;
+  LOG(INFO) << "Receive audio " << file_id;
   auto &a = audios_[file_id];
   if (a == nullptr) {
     a = std::move(new_audio);
@@ -113,6 +114,8 @@ bool AudiosManager::merge_audios(FileId new_id, FileId old_id, bool can_delete_o
     LOG(ERROR) << "Old file id is invalid";
     return true;
   }
+
+  LOG(INFO) << "Merge audios " << new_id << " and " << old_id;
   const Audio *old_ = get_audio(old_id);
   CHECK(old_ != nullptr);
   if (old_id == new_id) {
diff --git a/td/telegram/DocumentsManager.cpp b/td/telegram/DocumentsManager.cpp
index 9163f1de8..479a25183 100644
--- a/td/telegram/DocumentsManager.cpp
+++ b/td/telegram/DocumentsManager.cpp
@@ -279,6 +279,7 @@ std::pair<DocumentsManager::DocumentType, FileId> DocumentsManager::on_get_docum
 
 FileId DocumentsManager::on_get_document(std::unique_ptr<Document> new_document, bool replace) {
   auto file_id = new_document->file_id;
+  LOG(INFO) << "Receive document " << file_id;
   auto &d = documents_[new_document->file_id];
   if (d == nullptr) {
     d = std::move(new_document);
@@ -436,6 +437,8 @@ bool DocumentsManager::merge_documents(FileId new_id, FileId old_id, bool can_de
     LOG(ERROR) << "Old file id is invalid";
     return true;
   }
+
+  LOG(INFO) << "Merge documents " << new_id << " and " << old_id;
   const Document *old_ = get_document(old_id);
   CHECK(old_ != nullptr);
   if (old_id == new_id) {
diff --git a/td/telegram/MessagesManager.cpp b/td/telegram/MessagesManager.cpp
index d4e8d70c4..845222787 100644
--- a/td/telegram/MessagesManager.cpp
+++ b/td/telegram/MessagesManager.cpp
@@ -17803,7 +17803,7 @@ FullMessageId MessagesManager::on_send_message_success(int64 random_id, MessageI
       case MessageAnimation::ID: {
         auto content = static_cast<MessageAnimation *>(sent_message->content.get());
         if (new_file_id != content->file_id) {
-          td_->animations_manager_->merge_animations(new_file_id, content->file_id, true);
+          td_->animations_manager_->merge_animations(new_file_id, content->file_id, false);
           content->file_id = new_file_id;
           is_content_changed = true;
         }
@@ -17812,7 +17812,7 @@ FullMessageId MessagesManager::on_send_message_success(int64 random_id, MessageI
       case MessageAudio::ID: {
         auto content = static_cast<MessageAudio *>(sent_message->content.get());
         if (new_file_id != content->file_id) {
-          td_->audios_manager_->merge_audios(new_file_id, content->file_id, true);
+          td_->audios_manager_->merge_audios(new_file_id, content->file_id, false);
           content->file_id = new_file_id;
           is_content_changed = true;
         }
@@ -17821,7 +17821,7 @@ FullMessageId MessagesManager::on_send_message_success(int64 random_id, MessageI
       case MessageDocument::ID: {
         auto content = static_cast<MessageDocument *>(sent_message->content.get());
         if (new_file_id != content->file_id) {
-          td_->documents_manager_->merge_documents(new_file_id, content->file_id, true);
+          td_->documents_manager_->merge_documents(new_file_id, content->file_id, false);
           content->file_id = new_file_id;
           is_content_changed = true;
         }
@@ -17843,7 +17843,7 @@ FullMessageId MessagesManager::on_send_message_success(int64 random_id, MessageI
       case MessageSticker::ID: {
         auto content = static_cast<MessageSticker *>(sent_message->content.get());
         if (new_file_id != content->file_id) {
-          td_->stickers_manager_->merge_stickers(new_file_id, content->file_id, true);
+          td_->stickers_manager_->merge_stickers(new_file_id, content->file_id, false);
           content->file_id = new_file_id;
           is_content_changed = true;
         }
@@ -17852,7 +17852,7 @@ FullMessageId MessagesManager::on_send_message_success(int64 random_id, MessageI
       case MessageVideo::ID: {
         auto content = static_cast<MessageVideo *>(sent_message->content.get());
         if (new_file_id != content->file_id) {
-          td_->videos_manager_->merge_videos(new_file_id, content->file_id, true);
+          td_->videos_manager_->merge_videos(new_file_id, content->file_id, false);
           content->file_id = new_file_id;
           is_content_changed = true;
         }
@@ -17861,7 +17861,7 @@ FullMessageId MessagesManager::on_send_message_success(int64 random_id, MessageI
       case MessageVideoNote::ID: {
         auto content = static_cast<MessageVideoNote *>(sent_message->content.get());
         if (new_file_id != content->file_id) {
-          td_->video_notes_manager_->merge_video_notes(new_file_id, content->file_id, true);
+          td_->video_notes_manager_->merge_video_notes(new_file_id, content->file_id, false);
           content->file_id = new_file_id;
           is_content_changed = true;
         }
@@ -17870,7 +17870,7 @@ FullMessageId MessagesManager::on_send_message_success(int64 random_id, MessageI
       case MessageVoiceNote::ID: {
         auto content = static_cast<MessageVoiceNote *>(sent_message->content.get());
         if (new_file_id != content->file_id) {
-          td_->voice_notes_manager_->merge_voice_notes(new_file_id, content->file_id, true);
+          td_->voice_notes_manager_->merge_voice_notes(new_file_id, content->file_id, false);
           content->file_id = new_file_id;
           is_content_changed = true;
         }
@@ -21579,7 +21579,7 @@ bool MessagesManager::update_message_content(DialogId dialog_id, const Message *
   bool need_update = false;
   int32 old_content_type = old_content->get_id();
   int32 new_content_type = new_content->get_id();
-  bool can_delete_old_document = old_message->message_id.is_yet_unsent();
+  bool can_delete_old_document = old_message->message_id.is_yet_unsent() && false;
   if (old_content_type != new_content_type) {
     need_update = true;
     LOG(INFO) << "Message content has changed its type from " << old_content_type << " to " << new_content_type;
diff --git a/td/telegram/StickersManager.cpp b/td/telegram/StickersManager.cpp
index 4de40df5b..755aec212 100644
--- a/td/telegram/StickersManager.cpp
+++ b/td/telegram/StickersManager.cpp
@@ -855,6 +855,7 @@ tl_object_ptr<telegram_api::InputStickerSet> StickersManager::get_input_sticker_
 
 FileId StickersManager::on_get_sticker(std::unique_ptr<Sticker> new_sticker, bool replace) {
   auto file_id = new_sticker->file_id;
+  LOG(INFO) << "Receive sticker " << file_id;
   auto &s = stickers_[file_id];
   if (s == nullptr) {
     s = std::move(new_sticker);
@@ -1060,6 +1061,8 @@ bool StickersManager::merge_stickers(FileId new_id, FileId old_id, bool can_dele
     LOG(ERROR) << "Old file id is invalid";
     return true;
   }
+
+  LOG(INFO) << "Merge stickers " << new_id << " and " << old_id;
   const Sticker *old_ = get_sticker(old_id);
   CHECK(old_ != nullptr);
   if (old_id == new_id) {
diff --git a/td/telegram/VideoNotesManager.cpp b/td/telegram/VideoNotesManager.cpp
index 92a85df67..cbf475ecb 100644
--- a/td/telegram/VideoNotesManager.cpp
+++ b/td/telegram/VideoNotesManager.cpp
@@ -50,6 +50,7 @@ tl_object_ptr<td_api::videoNote> VideoNotesManager::get_video_note_object(FileId
 
 FileId VideoNotesManager::on_get_video_note(std::unique_ptr<VideoNote> new_video_note, bool replace) {
   auto file_id = new_video_note->file_id;
+  LOG(INFO) << "Receive video note " << file_id;
   auto &v = video_notes_[file_id];
   if (v == nullptr) {
     v = std::move(new_video_note);
@@ -113,6 +114,8 @@ bool VideoNotesManager::merge_video_notes(FileId new_id, FileId old_id, bool can
     LOG(ERROR) << "Old file id is invalid";
     return true;
   }
+
+  LOG(INFO) << "Merge video notes " << new_id << " and " << old_id;
   const VideoNote *old_ = get_video_note(old_id);
   CHECK(old_ != nullptr);
   if (old_id == new_id) {
diff --git a/td/telegram/VideosManager.cpp b/td/telegram/VideosManager.cpp
index 6a92d896b..6c1a181cc 100644
--- a/td/telegram/VideosManager.cpp
+++ b/td/telegram/VideosManager.cpp
@@ -51,6 +51,7 @@ tl_object_ptr<td_api::video> VideosManager::get_video_object(FileId file_id) {
 
 FileId VideosManager::on_get_video(std::unique_ptr<Video> new_video, bool replace) {
   auto file_id = new_video->file_id;
+  LOG(INFO) << "Receive video " << file_id;
   auto &v = videos_[file_id];
   if (v == nullptr) {
     v = std::move(new_video);
@@ -132,6 +133,8 @@ bool VideosManager::merge_videos(FileId new_id, FileId old_id, bool can_delete_o
     LOG(ERROR) << "Old file id is invalid";
     return true;
   }
+
+  LOG(INFO) << "Merge videos " << new_id << " and " << old_id;
   const Video *old_ = get_video(old_id);
   CHECK(old_ != nullptr);
   if (old_id == new_id) {
diff --git a/td/telegram/VoiceNotesManager.cpp b/td/telegram/VoiceNotesManager.cpp
index 3e6724ce6..619ef3118 100644
--- a/td/telegram/VoiceNotesManager.cpp
+++ b/td/telegram/VoiceNotesManager.cpp
@@ -49,6 +49,7 @@ tl_object_ptr<td_api::voiceNote> VoiceNotesManager::get_voice_note_object(FileId
 
 FileId VoiceNotesManager::on_get_voice_note(std::unique_ptr<VoiceNote> new_voice_note, bool replace) {
   auto file_id = new_voice_note->file_id;
+  LOG(INFO) << "Receive voice note " << file_id;
   auto &v = voice_notes_[file_id];
   if (v == nullptr) {
     v = std::move(new_voice_note);
@@ -95,6 +96,8 @@ bool VoiceNotesManager::merge_voice_notes(FileId new_id, FileId old_id, bool can
     LOG(ERROR) << "Old file id is invalid";
     return true;
   }
+
+  LOG(INFO) << "Merge voice notes " << new_id << " and " << old_id;
   const VoiceNote *old_ = get_voice_note(old_id);
   CHECK(old_ != nullptr);
   if (old_id == new_id) {