Update app.py

app.py

@@ -108,12 +108,12 @@ def process_inputs(files, prefix):
 with gr.Blocks() as demo:
     gr.Markdown("## 📄🖼️ PDF 或圖片合成工具（背景為 7872x1200）")
 
-    with gr.Row():
+    with gr.Column():
         upload_files = gr.Files(label="上傳 PDF 或圖片", file_types=[".pdf", ".png", ".jpg", ".jpeg"])
         prefix_input = gr.Textbox(label="輸出檔案前綴 (選填)", placeholder="例如：project_")
         btn_run = gr.Button("開始合成", variant="primary")
 
-    with gr.Row():
+    with gr.Column():
         gallery = gr.Gallery(label="預覽", columns=3)
         zip_file = gr.File(label="下載 ZIP")
         log_output = gr.Textbox(label="處理日誌", interactive=False)