Sep 23 2019
As far as I can tell there is no easy way to determine how much storage an individual user's uploads are using in Steam! Is this correct or is there some functionality that I am missing.
Sep 25 2019
Seems that somebody has already put this as a request in uservoice: - https://office365.uservoice.com/forums/264636-general/suggestions/33060058-microsoft-stream-reports-...
This seems like a mammoth limitation as currently somebody could use a significant percentage of the company storage with "private" videos ... and it would be very hard for Stream admin to detect this.