I think an email or message notification letting us know if/when files were downloaded would be awesome. There have been sevral occations when I wasn't sure if the client recived the work or not (some are kinda slow to respond). If we had someway of knowing if the work sent was actually downloaded, we'd at least know it was being reviewd. Sure, we could use outside sites that do that but I'd rather have all work I do related to Upwork stay on Upwork. Anyway, just a thought.