Can I upload another video to a single videoId

No, you cannot upload multiple videos to the same videoId. Once a video has been added to a videoId, there can be no change of that video/videoId combination.

You’ll have to create a new videoId, and change the urls in all locations the original video was linked to.

Hello,
We would like to transition from Libcast to API.video; Unfortunately, being able to replace a video without changing the url/id is something that’s missing from API.video (but available with Libcast). Why choosing to remove this vital feature when creating this new platform ?

Thank you.