Update app.py

app.py

@@ -116,5 +116,6 @@ async def on_message(msg: cl.Message):
     if stream:
         await process_stream(stream, msg=stream_msg)
         message_history.append({"role": "system", "content": stream_msg.content})
+        image_history.append({"role": "system", "content": stream_msg.content})
 
     return stream_msg.content