Yeah, this would be great. I plan to have a lava map in a future game, and if I could have the background lava bubbling away, like in this GIF ( <a href="https://media.giphy.com/media/PhIsv6b9a9Jug/giphy.gif" rel="nofollow">https://media.giphy.com/media/PhIsv6b9a9Jug/giphy.gif</a> ) that would be neato. Hmmm, GIFs are poorly optimised (ie none), what about support for short/small mp4 files? Perhaps even roll20 could convert an uploaded GIF to mp4 on the fly? <a href="https://rigor.com/blog/2015/12/optimizing-animated" rel="nofollow">https://rigor.com/blog/2015/12/optimizing-animated</a>... I imagine a looped animation of a small character token or a background wouldnt be too large in file size.