wire flac_file as real download output

app.py

@@ -187,7 +187,7 @@ def generate(style, lyrics, cot, seed, cfg_scale, duration):
         "created_at": datetime.now(timezone.utc).isoformat(),
     }, song_id)
 
-    return flac_path, mp3_path, f"seed={seed} | {actual:.0f}s (asked {duration}s) | {os.path.getsize(mp3_path) // 1024}KB MP3 320kbps"
+    return flac_path, flac_path, mp3_path, f"seed={seed} | {actual:.0f}s (asked {duration}s) | {os.path.getsize(mp3_path) // 1024}KB MP3 320kbps"
 
 
 with gr.Blocks(title="YuE2-3B Music") as demo:
@@ -209,7 +209,7 @@ with gr.Blocks(title="YuE2-3B Music") as demo:
             flac_file = gr.File(label="Download FLAC")
             mp3_file = gr.File(label="Download MP3 320kbps")
             info = gr.Textbox(label="Info")
-    btn.click(fn=generate, inputs=[style, lyrics, cot, seed, cfg, duration], outputs=[audio, mp3_file, info], queue=True)
+    btn.click(fn=generate, inputs=[style, lyrics, cot, seed, cfg, duration], outputs=[audio, flac_file, mp3_file, info], queue=True)
     duration.change(fn=_dur_label, inputs=duration, outputs=duration_txt)
     gr.Markdown(
         "---\n🎶 **Community songs:** every generation is auto-shared to the "