Start with the right checks.
A document that exists but contains the wrong changes needs a different approach from a missing document. Establish approximately when it last looked right.
What to do next.
Confirm the file and the account or library that owns it.
Open Version history using the supported OneDrive or SharePoint interface.
Compare the available versions and dates with the work you need.
Restore only the intended version after checking the effect on current collaborators.
Check the result.
Open the result and confirm the required content. Retain enough information to explain which version was chosen.
Stop and get help if…
The needed version is absent, versioning is restricted or several files were affected. Review available recovery coverage before rolling back an entire workspace.