Update app.py

app.py

@@ -125,14 +125,14 @@ with gr.Blocks(css="#chatbot{height:300px} .overflow-y-auto{height:500px}") as d
     # file_msg = btn.upload(add_file, [chatbot, btn], [chatbot], queue=False).then(
     #     bot, chatbot, chatbot
     # )
-    txt_msg = txt.submit(on_text_submit, [chatbot, txt], [chatbot, txt]).then(
+   txt_msg = txt.submit(on_text_submit, [chatbot, txt], [chatbot, txt]).then(
         None, 
         None,  
         [chatbot]
     )
     file_msg = btn.upload(on_file_upload, [chatbot, btn], [chatbot]).then(
+        on_file_upload,   
         None,
-        None,
-        [chatbot]
-    )
+        [chatbot, btn]  
+    ) 
 demo.launch()