The awesome Files feature would be even better if it could indicate that a file is linked elsewhere within your course -- on a Page, from other rich content, or as a Module item -- in an unobtrusive way.  If a file's linked-elsewhere status were indicated in Files, the benefits might include fewer broken links, fewer Page Errors reported, and easier content revision.  Ideally the indicator could also help an instructor or designer locate content elsewhere in the course which uses this file.