Update app.py

app.py

@@ -780,6 +780,13 @@ with gr.Blocks(theme="Nymbo/Nymbo_Theme", css=css, delete_cache=(60, 3600)) as a
         outputs=history_gallery,
     )
 
+    upscale_input.upload(
+        lambda x: gr.update(interactive=x is not None),
+        inputs=[upscale_input],
+        outputs=[upscale_button]
+    )
+
+    
     upscale_button.click(
         infer_upscale,
         inputs=[