fix: Add upload step to description

app.py

@@ -580,7 +580,7 @@ with gr.Blocks() as demo:
     gr.Markdown(
         """
             # 🏞 AI Video Composer: FFMPEG in Plain English
-            Describe what you want and AI generates the FFMPEG command. Create slideshows, add music, merge clips, visualize audio waveforms, and more.
+            Upload your media files, describe what you want, and AI generates the FFMPEG command. Create slideshows, add music, merge clips, visualize audio waveforms, and more.
         """,
         elem_id="header",
     )