Try changing interactive state a different way

app.py

@@ -78,7 +78,7 @@ def gallery_selected(evt: gr.SelectData):
 
     :return: index of the currently selected image
     """
-    proceed_button.interactive = evt.selected
+    proceed_button.interactive = gr.Button(interactive=evt.selected)
     print(f"Index: {evt.index}, Value: {evt.value}, Selected: {evt.selected}")
     return evt.index
 
@@ -99,7 +99,7 @@ if __name__ == "__main__":
                     yolos_input = gr.Image(type="pil")
                     yolos_submit = gr.Button("Submit")
                 yolos_output = gr.Gallery(label="Detected Objects", object_fit="scale-down", columns=3, scale=1,
-                                          show_share_button=False, allow_preview=False, selected_index=None)
+                                          show_share_button=False, selected_index=None)
 
             with gr.Row():
                 yolos_selected = gr.TextArea(label="Selected Image Index")