iTunes won't let me save album artwork

iTunes won't let me save Album artwork. Here's what happens:

When I add album artwork the picture displays in the artwork area and I choose, "ok". I then get a message that asks me if I am certain I want to add to multiple items and I say "yes". However, the artwork didn't save. Next time I open up a song, the artwork is missing.

I found the following advice from an iTunes answer from 2015. I followed the instructions. They did not solve the problem.

"iTunes cannot add artwork to tracks in .wav format, that are locked as read-only, or for which the security permissions are set incorrectly. See Repair security permissions for iTunes for Windows.

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I have Windows 10 PC and am using iTunes version 12.7.3.46 Please help me solve this problem. I have tons of albums to record.

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