diff --git a/telegram-bot-api/Client.cpp b/telegram-bot-api/Client.cpp
index 7a1bd5c..ec518a7 100644
--- a/telegram-bot-api/Client.cpp
+++ b/telegram-bot-api/Client.cpp
@@ -10025,6 +10025,33 @@ td_api::object_ptr<td_api::inputThumbnail> Client::get_input_thumbnail(const Que
   return make_object<td_api::inputThumbnail>(std::move(input_file), 0, 0);
 }
 
+td::Result<td_api::object_ptr<td_api::inputThumbnail>> Client::get_input_thumbnail(const Query *query,
+                                                                                   const td::JsonObject &object,
+                                                                                   bool allow_legacy) const {
+  TRY_RESULT(thumbnail, object.get_optional_string_field("thumbnail"));
+  if (allow_legacy) {
+    if (thumbnail.empty()) {
+      TRY_RESULT_ASSIGN(thumbnail, object.get_optional_string_field("thumb"));
+    }
+    auto thumbnail_input_file = get_input_file(query, td::Slice(), thumbnail, true);
+    if (thumbnail_input_file == nullptr) {
+      thumbnail_input_file = get_input_file(query, "thumbnail", td::Slice(), true);
+      if (thumbnail_input_file == nullptr) {
+        thumbnail_input_file = get_input_file(query, "thumb", td::Slice(), true);
+      }
+    }
+    if (thumbnail_input_file != nullptr) {
+      return make_object<td_api::inputThumbnail>(std::move(thumbnail_input_file), 0, 0);
+    }
+  } else {
+    auto thumbnail_input_file = get_input_file(query, "thumbnail", thumbnail, true);
+    if (thumbnail_input_file != nullptr) {
+      return make_object<td_api::inputThumbnail>(std::move(thumbnail_input_file), 0, 0);
+    }
+  }
+  return nullptr;
+}
+
 td::Result<td_api::object_ptr<td_api::InputMessageContent>> Client::get_input_message_content(
     td::JsonValue &input_message_content, bool is_input_message_content_required) {
   CHECK(input_message_content.type() == td::JsonValue::Type::Object);
@@ -11636,22 +11663,7 @@ td::Result<td_api::object_ptr<td_api::InputMessageContent>> Client::get_input_me
   if (input_file == nullptr) {
     return td::Status::Error("media not found");
   }
-
-  TRY_RESULT(thumbnail, object.get_optional_string_field("thumbnail"));
-  if (thumbnail.empty()) {
-    TRY_RESULT_ASSIGN(thumbnail, object.get_optional_string_field("thumb"));
-  }
-  auto thumbnail_input_file = get_input_file(query, td::Slice(), thumbnail, true);
-  if (thumbnail_input_file == nullptr) {
-    thumbnail_input_file = get_input_file(query, "thumbnail", td::Slice(), true);
-    if (thumbnail_input_file == nullptr) {
-      thumbnail_input_file = get_input_file(query, "thumb", td::Slice(), true);
-    }
-  }
-  object_ptr<td_api::inputThumbnail> input_thumbnail;
-  if (thumbnail_input_file != nullptr) {
-    input_thumbnail = make_object<td_api::inputThumbnail>(std::move(thumbnail_input_file), 0, 0);
-  }
+  TRY_RESULT(input_thumbnail, get_input_thumbnail(query, object, true));
 
   TRY_RESULT(type, object.get_required_string_field("type"));
   if (type == "photo") {
@@ -11770,13 +11782,7 @@ td::Result<td_api::object_ptr<td_api::inputPaidMedia>> Client::get_input_paid_me
   if (input_file == nullptr) {
     return td::Status::Error("media not found");
   }
-
-  object_ptr<td_api::inputThumbnail> input_thumbnail;
-  TRY_RESULT(thumbnail, object.get_optional_string_field("thumbnail"));
-  auto thumbnail_input_file = get_input_file(query, "thumbnail", thumbnail, true);
-  if (thumbnail_input_file != nullptr) {
-    input_thumbnail = make_object<td_api::inputThumbnail>(std::move(thumbnail_input_file), 0, 0);
-  }
+  TRY_RESULT(input_thumbnail, get_input_thumbnail(query, object, true));
 
   TRY_RESULT(width, object.get_optional_int_field("width"));
   TRY_RESULT(height, object.get_optional_int_field("height"));
diff --git a/telegram-bot-api/Client.h b/telegram-bot-api/Client.h
index 06e21f8..d0b9a72 100644
--- a/telegram-bot-api/Client.h
+++ b/telegram-bot-api/Client.h
@@ -542,6 +542,9 @@ class Client final : public WebhookActor::Callback {
 
   object_ptr<td_api::inputThumbnail> get_input_thumbnail(const Query *query) const;
 
+  td::Result<object_ptr<td_api::inputThumbnail>> get_input_thumbnail(const Query *query, const td::JsonObject &object,
+                                                                     bool allow_legacy = false) const;
+
   static td::Result<object_ptr<td_api::inlineQueryResultsButton>> get_inline_query_results_button(
       td::JsonValue &&value);