Update app.py

app.py

@@ -71,8 +71,8 @@ def upload_file(data_file):
 
 with gr.Blocks() as demo:
     with gr.Column():
-    u = gr.UploadButton("Upload a file", file_count="single")
-    u.upload(upload_file, u)
+        u = gr.UploadButton("Upload a file", file_count="single")
+        u.upload(upload_file, u)
     gr.ChatInterface(
         yes_man,
         chatbot=gr.Chatbot(height=300),