Update app.py

app.py

@@ -108,6 +108,6 @@ with gr.Blocks(css=css) as demo:
 
     submit_btn.click(fn=infer, inputs=[image_in, audience, keyword_in, protagonist_in], outputs=[chapter_story, chapter_image])
     next_chapter_btn.click(fn=lambda: next_chapter(audience=audience.value, keyword=keyword_in.value, protagonist=protagonist_in.value), outputs=[chapter_story, chapter_image])
-    save_pdf_btn.click(fn=save_as_pdf, outputs=gr.Download(label="PDF 다운로드"))
+    save_pdf_btn.click(fn=save_as_pdf, outputs=gr.File(label="PDF 다운로드"))
 
     demo.queue(max_size=12).launch()