Vimeo provides an API that allows uploading video in JS. I'm uploading video using the resumable approach and it requires knowing how many bytes this video contains. And it's easy to implement when a user upload only one file and it's easy to extract.

Today I need to implement the following logic: I need to ask some questionы to a user and they have 30 sec to record a video answering it. After that, I need to merge those clips somehow and upload them to Vimeo. Is there anybody who already implemented this?

• should I keep these clips in memory and after that calculate how many bytes they take and upload via tus protocol (but I'm afraid here that I have a limitation on how many memory I may use)
• is there any other way to upload each clip separately in Vimeo and afterwards to combine them in one via some their API (I have not found it)

Thank you for any help here.