If you can’t edit a file, a few things could be wrong:
- The file owner didn’t give you permission to view the file.
- You're signed in to a different Google Account.
- Someone else with edit access removed your permission to edit.
You can only request edit access from a computer, but you can see what access you already have on your phone or tablet.
Get more help
If these options didn't help, see some answers in the Google Drive forum.