How to generate nfo metadata for old media files?

[DPaO Chow]

I have a large media library which wasn't enable 'save .nfo metadata' before, several months ago i've enabled it for most of my necessary libraries.
However, jellyfin will just generate nfo for new and uploaded media files, the existed media were not affected.

How to re-generate nfo for all of the files in my library?

(JF version 10.9.2)

[TheDreadPirate]

You will have to rescan and select "replace all metadata".