Google Drive Attachments iOS



I am using the iOS app more and more. It has come along a lot and is 80% there. One challenge I am having is dealing with attachments, which again is about 80% there. If a teammate attaches a google docs file, and I access that attachment through iOS, it loads in Google Docs just fine. But if I try to attach a file from Google docs it converts to a PDF. I can manually put the link in but that sometimes causes some confusion with my team. Am I missing something or is conversion to a PDF the expected behavior?