Allow import of VTT

Hey 👋,

I'm currently automating a lot of my workflow and using an external service to generate transcripts for my videos. Based on these transcripts, I create VTT files, and it would be amazing if I could import a VTT file directly—or at least have full control over editing the VTT file within the platform.

Right now, I can only export the file or make very limited edits, and I’m unable to modify the timestamps, which is a bit restrictive for my use case.

Thanks a lot for considering this!