How to load a file already on a Mac & get it into Music
I have an m4a file on my Mac Pro (wi Catalina). I get into Music, do the import command, select the file. Then nothing happens - it doesn't load anything. It doesn't say why not. It just ignores the command. The file is my own, with no copyright.
How do I make it load the file into Music?
Mac Pro, macOS 10.15