How do I lock a file in the library to prevent future editing after I've approved the file?
Hi dianew,
It is currently has not been supported yet. I have seen similar request at Flow ideas Forum, it seems that it will be coming soon, please check it at here:
https://powerusers.microsoft.com/t5/Flow-Ideas/Allow-to-check-in-check-out-and-publish-files-in-a-SharePoint/idi-p/11256
You could consider to vote the idea. I will help collect and report it on my side also.
Best regards,
Mabel Mao
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