Add support for audio input upload in demo interface

app.py

@@ -291,7 +291,7 @@ with gr.Blocks(title="PersonaPlex Demo", theme=gr.themes.Soft()) as demo:
         with gr.Column(scale=2):
             audio_input = gr.Audio(
                 label="🎤 Record your message",
-                sources=["microphone"],
+                sources=["microphone", "upload"],
                 type="numpy",
             )
             generate_btn = gr.Button("Generate Response", variant="primary", size="lg")