I actually removed the Substance plugin from my project back in December, as there were issues with the plugin at the time that were blocking me from moving forward. But I've been keeping an eye on the plugin development to determine when it has reached a sufficiently stable state to begin reintroducing into my game. (For now, I'm just exporting textures via Substance Designer instead of using the plugin.) So, with the new plugin release I was considering installing the plugin to see how things went. But I use asset bundles heavily, on objects that would ideally be using substance materials. So if that's not supported yet, I'll have to keep waiting for a future update. Thanks for confirming that it's in the works for 2.4.