diff --git a/benchmark/bench_crypto.cpp b/benchmark/bench_crypto.cpp
index 222d9f56..29ceaa1d 100644
--- a/benchmark/bench_crypto.cpp
+++ b/benchmark/bench_crypto.cpp
@@ -30,7 +30,7 @@ class SHA1Bench : public td::Benchmark {
   alignas(64) unsigned char data[DATA_SIZE];
 
   std::string get_description() const override {
-    return PSTRING() << "SHA1 OpenSSL [" << (DATA_SIZE >> 10) << "KB]";
+    return PSTRING() << "SHA1 OpenSSL [" << (DATA_SIZE >> 10) << "kB]";
   }
 
   void start_up() override {
@@ -55,7 +55,7 @@ class AESBench : public td::Benchmark {
   td::UInt256 iv;
 
   std::string get_description() const override {
-    return PSTRING() << "AES OpenSSL [" << (DATA_SIZE >> 10) << "KB]";
+    return PSTRING() << "AES OpenSSL [" << (DATA_SIZE >> 10) << "kB]";
   }
 
   void start_up() override {
@@ -152,7 +152,7 @@ class Crc32Bench : public td::Benchmark {
   alignas(64) unsigned char data[DATA_SIZE];
 
   std::string get_description() const override {
-    return PSTRING() << "Crc32 zlib [" << (DATA_SIZE >> 10) << "KB]";
+    return PSTRING() << "Crc32 zlib [" << (DATA_SIZE >> 10) << "kB]";
   }
 
   void start_up() override {
@@ -176,7 +176,7 @@ class Crc64Bench : public td::Benchmark {
   alignas(64) unsigned char data[DATA_SIZE];
 
   std::string get_description() const override {
-    return PSTRING() << "Crc64 Anton [" << (DATA_SIZE >> 10) << "KB]";
+    return PSTRING() << "Crc64 Anton [" << (DATA_SIZE >> 10) << "kB]";
   }
 
   void start_up() override {
diff --git a/td/telegram/files/FileManager.cpp b/td/telegram/files/FileManager.cpp
index 19240136..7fcc5222 100644
--- a/td/telegram/files/FileManager.cpp
+++ b/td/telegram/files/FileManager.cpp
@@ -624,7 +624,8 @@ string FileManager::get_file_name(FileType file_type, Slice path) {
 }
 
 Status FileManager::check_local_location(FullLocalFileLocation &location, int64 &size) {
-  constexpr int64 MAX_THUMBNAIL_SIZE = 200 * (1 << 10) /* 200KB */;
+  constexpr int64 MAX_THUMBNAIL_SIZE = 200 * (1 << 10) /* 200 kB */;
+  constexpr int64 MAX_PHOTO_SIZE = 10 * (1 << 20) /* 10 MB */;
 
   if (location.path_.empty()) {
     return Status::Error("File must have non-empty path");
@@ -659,7 +660,11 @@ Status FileManager::check_local_location(FullLocalFileLocation &location, int64
   }
   if ((location.file_type_ == FileType::Thumbnail || location.file_type_ == FileType::EncryptedThumbnail) &&
       size >= MAX_THUMBNAIL_SIZE && !begins_with(PathView(location.path_).file_name(), "map")) {
-    return Status::Error(PSLICE() << "File \"" << location.path_ << "\" is too big for thumbnail "
+    return Status::Error(PSLICE() << "File \"" << location.path_ << "\" is too big for a thumbnail "
+                                  << tag("size", format::as_size(size)));
+  }
+  if (location.file_type_ == FileType::Photo && size >= MAX_PHOTO_SIZE) {
+    return Status::Error(PSLICE() << "File \"" << location.path_ << "\" is too big for a photo "
                                   << tag("size", format::as_size(size)));
   }
   if (size >= MAX_FILE_SIZE) {
diff --git a/tdutils/td/utils/format.h b/tdutils/td/utils/format.h
index 02775eee..14b13ef1 100644
--- a/tdutils/td/utils/format.h
+++ b/tdutils/td/utils/format.h
@@ -192,7 +192,7 @@ inline StringBuilder &operator<<(StringBuilder &logger, Size t) {
     uint64 value;
   };
 
-  static constexpr NamedValue sizes[] = {{"B", 1}, {"KB", 1 << 10}, {"MB", 1 << 20}, {"GB", 1 << 30}};
+  static constexpr NamedValue sizes[] = {{"B", 1}, {"kB", 1 << 10}, {"MB", 1 << 20}, {"GB", 1 << 30}};
   static constexpr size_t sizes_n = sizeof(sizes) / sizeof(NamedValue);
 
   size_t i = 0;