Best practices for handling video preview + export workflows in Flutter apps (timeline-style UI + external media sources)

I’ve been exploring how Flutter apps handle media-heavy workflows, especially where users work with externally generated video assets (for example, videos created in tools like capcut pc ) and then manage them inside a Flutter-based interface.

My main focus is building a clean UI where users can preview videos and track processing states like upload or export completion when the actual rendering happens outside the app.

What is the recommended architecture for managing video preview + metadata in Flutter apps when dealing with externally generated video files?

Any guidance on common patterns or state management approaches for this kind of setup would be really helpful.