Suggested UI change
In OneDrive for iOS, when you select a file to work with, the action bar at the top of the app has some useful icons to download, delete or move the item. As it is now, the trash can is in between the download and move icons, and I think it would be wise to move the trash can icon away from the others, so users don’t accidentally push the trash can icon and delete a file that they actually wanted to download or move.
This is especially important as the screen is small, so the icons are less than a quarter inch apart.
Hope this helps!