Word, PowerPoint, JPEG, and PNG should all be supported by Attach since onCampus assignment annotations supports all those file types. However, other file types should be allowed too so OnCampus could be used to collect any digital work (even if it couldn't be marked on using onCampus). I needed an easy way for students to submit an Excel project from iPads, but I can't use OnCampus for that since Attach will only come up for Open In or Share with PDFs. I had to create student assignment folders in Google Drive for this instead since the Drive app accepts multiple file types including Excel.