Dear Jason.A...
Good day! Thank you for posting to Microsoft Community. I am happy to help you
In Windows 11 this is not longer working.
I want to make sure that after you click Sync in the SharePoint document library, the SharePoint document library does not appear in the File Explorer? Or you can see the file but you don't have the option to check in and check out.
Can I sync Sharepoint files with OneDrive and be able to check in/check out from File Explorer?
If you can not see check in/check out files which saved in SharePoint. Could I first confirm that if you open the file through the client, you can click File-Info and then check out the file, you can refer to my test screenshot:
This further helps me narrow down this phenomenon. I also want to confirm whether this phenomenon occurs in a specific file?
I look forward to your reply. Thanks for your cooperation.
Sincerely,
Tin | Microsoft Community Moderator