Mass update for case conversion gets error message "Can’t access file via secure bookmark"

2019 Macbook Pro Touch Bar running MacOSX 12.6. Monterey

Batch of songs copied from external to hard drive within laptop. I dragged the files from the laptop folder into MP3Tag, chose case conversion. Each file individually came up with this error message "Can’t access file via secure bookmark".

I could not move forward. I read other posts about this, there didn't seem to be any solution. My free trail just expired. I am going to purchase but I'm hesitant now because of this error.

see e.g. here:

or use "secure bookmark" in the forum search.

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