Purchased songs (NOT from iTunes store) won't all download into iTunes.
I purchased a set of 3 cd's electronically from a non-iTunes site and all songs downloaded. I have purchased music from this site many times as Flac files. I convert them to m4a files and play them in iTunes. I have never had any problems doing this (over many years). Six of the 27 tracks (ie songs) wont load into iTunes now. I also can't play them in iTunes if I just click on them and tell iTunes to open them. But I can play them in Quicktime, Wondershare Player etc.
I have scoured the support site but can't find an identical post. I am using iTunes 12.9.5.5 on an iMac. Anyone have any suggestions? Thanks for any help you can provide, I am really stumped.
iMac 27″, macOS 10.14