Fix 3D preview output binding

app.py

@@ -245,8 +245,10 @@ with gr.Blocks(title="SAM 3D Objects MCP") as demo:
         reconstruct_btn = gr.Button("🚀 Reconstruct 3D", variant="primary", size="lg")
 
     with gr.Row():
-        output_model = gr.Model3D(label="3D Preview")
-        output_file = gr.File(label="Download GLB")
+        with gr.Column():
+            output_model = gr.Model3D(label="3D Preview")
+        with gr.Column():
+            output_file = gr.File(label="Download GLB")
 
     # Events
     segment_btn.click(
@@ -264,8 +266,9 @@ with gr.Blocks(title="SAM 3D Objects MCP") as demo:
     reconstruct_btn.click(
         reconstruct_3d,
         inputs=[input_image, mask_state],
-        outputs=[output_file, status]
+        outputs=[output_model, status]
     )
+    output_model.change(lambda x: x, inputs=[output_model], outputs=[output_file])
 
     gr.Markdown("""
     ---