If it’s a shared document, you’ll need permission to edit it in order to see its history.
The Doc will reload and display all the document changes in a panel on the right. You can name the versions by clicking the three-dot menu icon > Name this version. A document, drawing, or presentation can have up to 40 named versions; a spreadsheet can have up to 15 named versions.
You can also view more detailed versions from that day by clicking ▼ to the left of the version’s name.
Click Restore again to confirm the change. To return to the most current edit, repeat these steps to view the version history, then select the most recent version and restore it again. If you can’t see the version history, you may not have edit permission in the document. [1] X Research source
