iTunes Match won't load all new songs in Big Sur
I recently purchased some music from a non-Apple vendor (Presto Music) that provides lossless-quality sound files for classical music and jazz. I imported them to Music on my MacBook Pro running Big Sur, using X-Lossless Decoder (as I have done with other music files countless times) and using their MP3 320bps encoding protocol (as I have also done countless times). There are 68 songs in 3 albums. iTunes Match uploaded a small percentage of them to the cloud, but will not load any more.
I have clicked on "Update Cloud Library" many times, and Music says it is doing it, but the results don't change. The songs that haven't been uploaded still have the empty-cloud icon next to them in Music on my Mac and are greyed out in Music on my iPad and iPhone.
According to Music on my MacBook Pro, I have only 36,000 song files in Music, so I am well below the 100,000 song limit.
The quality of the MP3 files that I imported and want uploaded is the same high quality as others that have been successfully uploaded.
Any help, please? How can I fix this?
Many Thanks!!
MacBook Pro 13″, macOS 11.2