add sleep

src/Infrastructure/BotSharp.Core/Files/BotSharpFileService.Conversation.cs

@@ -230,6 +230,7 @@ public partial class BotSharpFileService
                 using var fs = new FileStream(Path.Combine(subDir, file.FileName), FileMode.Create);
                 fs.Write(bytes, 0, bytes.Length);
                 fs.Flush(true);
+                Thread.Sleep(2000);
             }
 
             return true;