Have you tried transferring the music by Bluetooth? Are you able to use the Phone Link? If you can use the Phone Link you may be able to drag and drop the music onto your phone.
I was able to drag and drop these songs into the folder I created on my Samsung Galaxy S20 Phone using the Phone Link. I created the folder for the songs on my phone and then had to select all the songs and drag and drop them into the folder. See Image below. Click on, tap, or activate image to enlarge it.