1. Open the Document Library in SharePoint and select the document for which you want to restore a previous version of the file.
2. Click on the ellipses (…) icon and select the Version History option from the expanded menu.
3. All the previous versions of the file will be listed, including the versions previously deleted.
4. Hover the mouse pointer over the version you want to restore and click on Restore.
5. A confirmation popup will appear and upon clicking the Restore button, the selected version will be restored.