Maybe that wasn't the issue.

app.py

@@ -160,9 +160,9 @@ demo = gr.Blocks(css=css)
 
 def changing():
     # https://discuss.huggingface.co/t/how-to-programmatically-enable-or-disable-components/52350/4
-    return gr.Button.update(interactive=True), gr.Button.update(interactive=True)
+    # return gr.Button.update(interactive=True), gr.Button.update(interactive=True)
     # return gr.Button(interactive=True), gr.Button(interactive=True)
-        
+    return gr.Button('Detect'), gr.Button('Detect')
 
 
 with demo: