Confused about Windows 10 File History backups

[Windows 10]

I set up the File History backup on my Windows 10 PC a few years ago to save the history info on my NAS. I think the save is working because I can see on the NAS my Documents folder structure and files like <filename>(<date and time>). But on the Windows 10 PC, when I use the "Previous Versions" tab in the File Properties it tells me "There are no previous versions available." If I click the History icon in the ribbon of File Manager, it tells me "File History is saving copies of your files for the first time." What is going wrong and how do I fix it?Thanks

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