I'd like to stay within my quota but don't know which artwork file is the biggest offender. Perhaps I uploaded a 10 MB file when a 2 MB one would do fine. Bonus points if you can point which campaign and page it is being used on, but that is a stretch feature. It seems files are uploaded to S3. They have a List option where you can get the file size in human readable format. Simply showing the top 50 items in your library sorted by max file size would do wonders in keeping tabs on the biggest files I have in my library.