Sorry about flooding this forum. I am trying to finish a test project before my trial runs out.
So I tried to upload a very reasonably-sized video (550 mb, and yes, that’s reasonable for a 12 minute equirectangular video). Partway through the upload I got the error in the attached image.
Another thing I encountered: you can’t multiselect objects unless the list view is displayed on the left. If you are in the “list of scenes” view (and not “list of objects”) ctrl-click on objects is identical to just clicking, with no multiselect.