Update app.py

app.py

@@ -56,7 +56,8 @@ def create_message(client, thread, msg):
     message = client.beta.threads.messages.create(
         role="user",
         thread_id=thread.id,
-        content=[msg["text"], msg["files"]],
+        content=msg["text"],
+        attachments=None,
     )
     
     show_json("message", message)