At least now Canvas is letting you schedule the downloads, so that part seems fixed.
Sometimes a Canvas item itself can be corrupted or incomplete, so if you want, I can try it in my game next time I open it. If you share the Canvas link (or the creator and item name), we can see whether the issue is with the object, Canvas, or something else.
I also saw an older post saying “Canvas objects” were under investigation, so it might be related.
Canvas objects - Under investigation-