Update app.py

app.py

@@ -138,7 +138,7 @@ def server(input, output, session: Session):
             id = "image_" + str(idx)
             ui.input_slider(id, "Opacity", 0, 1.0, 0.5)
 
-            plot_server(f"plot_{idx}", r=r, input[id]())
+            plot_server(f"plot_{idx}", r=r, opacity=input[id]())
             
             ui_output.append(
                 ui.div(