Vfs-cache-mode write use case

I’ve been searching but haven’t quite got an answer to this. What exactly does vfs-cache-mode write do? Does it remove the need for an upload script? Does it do something else?

It’s used if you need to edit a file, that’s really why I wold use it.

I was using ffmpeg on a file to remux it.

https://rclone.org/commands/rclone_mount/#vfs-cache-mode-writes