fix download button

app.py

@@ -225,7 +225,7 @@ def infer_geometry(
             gr.Model3D(value=mesh_seqs[idx], label=f"Frame: {frame_seqs[idx]}") for idx in range(len(frame_seqs))
         ] + [ 
             gr.Video(value=output_disp_path, label="Disparity", interactive=False), 
-            gr.DownloadButton("Download Npz File", value=output_npz_path, visible=True)
+            gr.DownloadButton("Download Npz File", value=output_npz_path)
         ]
     except Exception as e:
         gc.collect()
@@ -241,9 +241,6 @@ def infer_geometry(
         #     gr.DownloadButton("Download Npz File", visible=False)
         # ]
 
-def download_file():
-    return gr.DownloadButton(visible=False)
-
 def build_demo():
     with gr.Blocks(analytics_enabled=False) as gradio_demo:
         gr.Markdown(
@@ -332,7 +329,7 @@ def build_demo():
                     label="Disparity",
                     interactive=False
                 )
-                download_btn = gr.DownloadButton("Download Npz File", visible=False)
+                download_btn = gr.DownloadButton("Download Npz File")
 
         with gr.Row(equal_height=True):
             with gr.Column(scale=1):
@@ -433,11 +430,6 @@ def build_demo():
             ],
         )
 
-        download_btn.click(
-            fn=download_file,
-            outputs=download_btn
-        )
-
     return gradio_demo