Hey there Ade. I tested that, and I'm not sure what's going on (it's not working to my satisfaction either), but I feel like (in my opinion) it is not a particularly great image for Foreground Layer testing or in terms of animation. It's like, not a very great animation file. The clouds in it are sparse, dark color, dim, and not distinctive in range of colors. So it's not really showing up against a color map, aside from any issues with the animation. As well I am also having animation problems with it. It seems to cycle once (taking maybe 1-2 seconds), and not loop. Roll20 animations generally loop over and over until you (the GM) hits Pause button. Certainly clouds should loop. Unclear to me if that animation file is bugged, or some issue with roll20 (?) But what I can reassure you, generally Roll20 Marketplace animation overlays work fine on Foreground Layer, and they loop. I've used ones like water of a swimming pool, and a swirling vortex, in the past month since Roll20 debuted the Foreground layer. It works. You could try reporting that graphic's malfunction to Roll20 Help Center, I don't know if they can fix it or replace it, or advise some steps for users to make it work. My advice is get some other overlay animation graphics, and proceed with testing this foreground layer feature. Screenshot of the Foreground Sampler animated clouds file, which seems to Not Loop and also barely shows up anyway with the dim colors
