It can be difficult to see who made certain changes and when to a document that multiple people are working on. By using version history in Google Docs, Sheets, and Slides, you can see all of the updates made to your file.
To see an earlier version of your file, or revert to an older version:
- Open your file in Google Drive.
- Select File > Version history > See version history.
- Click a timestamp to see a previous version of the file.
- Click Restore this version to make it the active version.
(You need Owner or Can edit access to the file to see version history.)