Доработано управление жизненным циклом

BotPages.Telegram/TelegramAdapter.cs

@@ -402,6 +402,7 @@ public sealed class TelegramAdapter : IMessengerAdapterSetup
         {
             MessageFormat.Html => ParseMode.Html,
             MessageFormat.Markdown => ParseMode.MarkdownV2,
+            MessageFormat.Plain => ParseMode.None,
             _ => ParseMode.None,
         };
     }

BotPages.Telegram/TelegramUpdateMapper.cs

@@ -198,15 +198,21 @@ public static class TelegramUpdateMapper
 
     private static Func<CancellationToken, Task<Stream>> GetStreamAsync(TelegramBotClient client, string fileId)
     {
-        Func<CancellationToken, Task<Stream>> getStreamAsync = async _ =>
+        return async ct =>
         {
-            var file = await client.GetFile(fileId);
-            var stream = new MemoryStream();
-            await client.DownloadFile(file, stream);
-            stream.Position = 0;
-            return stream;
+            try
+            {
+                var file = await client.GetFile(fileId, ct);
+                var stream = new MemoryStream();
+                await client.DownloadFile(file.FilePath!, stream, ct);
+                stream.Position = 0;
+                return stream;
+            }
+            catch (Exception ex)
+            {
+                return Stream.Null;
+                throw;
+            }
         };
-
-        return getStreamAsync;
     }
 }