Update app.py

app.py

@@ -214,6 +214,7 @@ def build_demo(embed_mode, concurrency_count=1):
         with gr.Row():
             with gr.Column(scale=3):
                 imagebox = gr.Image(type="numpy", label="Input Screenshot", placeholder="""#Try ShowUI with screenshots!
+                
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                 For macOS: Command + Shift + 3,
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