Hello, let me open by saying I am very impressed by the flexibility of the Roll20 system even as a Free user, the ability to upload webm for use as tokens and map flavor is a phenomenal idea. It's the ultimate "wow" factor I am happy to make use of, as an animator. I've been stress testing it so to speak by playing with different types of transparency and canvas sizes, and have hit a snag when trying to upload a 60 second 557kb webm with transparency at 3200x2400. The file is a loop of a moving crowd of tiny people I have moving throughout one of my town maps, to be overlayed on top of it. It simply does not progress past the "Uploading..." dialog box. It's well below the size limit so that is clearly not the issue, so I figure it must be some unlisted limit for canvas sizes or something. Maybe the system is just not cut out for such things. I've heard of people using it for animated weather effects before, so that's why I'm not so sure.
