Update app.py

app.py

@@ -437,6 +437,7 @@ def create_demo():
                 with gr.Row():
                     submit_btn = gr.Button("Submit")
                     clear_btn = gr.Button("Clear")
+                    cancel_btn = gr.Button("Cancel", variant="secondary")
                     
                 progress_md = gr.Markdown("Idle")
                 output_md = gr.Markdown("")
@@ -808,11 +809,10 @@ def create_demo():
                 print(f"Failed to update preview: {e}")
                 return gr.update(value=None, visible=False), gr.update(value=None, visible=False), ""
 
-        preview_path_state.change(fn=apply_preview, inputs=[preview_path_state], outputs=[preview_image, preview_video, preview_status])
+        preview_path_state.change(fn=apply_preview, inputs=[preview_path_state, prev_preview_state], outputs=[preview_image, preview_video, preview_status])
 
     demo.queue()
     return demo
 
 if __name__ == "__main__":
     create_demo().launch(share=False, server_name="0.0.0.0", server_port=7860, max_threads=8)
-