Fix so it works with users without name

main.py

@@ -252,7 +252,7 @@ async def attachment(message: types.Message):
         return
 
     file = await bot.get_file(file_id)
-    user_id = message.chat.full_name
+    user_id = message.chat.id
     await file.download(f"{user_id}.{file_format}")
     
     if file_format == "ogg":