Maps simply never upload, no matter how small I make the file, or what format I try. Some people seem to get it to work after hours, but that is functionally the same as not working. Smaller assets, like tokens, will periodically just become a solid color blobs. The extension that shall not be named has somehow had easy to use animated backgrounds in Roll20 for ages and yet the official app chugs along with unusable assets for sale in the store.