A: Yes, you can use pre-recorded videos in two ways with ZenStream:

Stream as live- if you want to present the MP4 as a live stream, you can load the file into a tool like OBS (free software) and stream it through ZenStream. OBS also lets you loop the file if needed.

Upload directly- you can upload an MP4 (or other file) straight to your ZenStream dashboard, and it will be available as a recorded file on your website (just like the auto-recorded live streams).