One problem that users will encounter, when they first start working with these new apps, is where the files are stored. (Previously, Books only managed ebooks it has inherited audiobooks from iTunes.) In addition to the Music app, which is more or less the replacement for iTunes, there are three other apps that manage media files: Since the release of macOS Catalina, Apple has removed some of iTunes’ media management functions and created new apps.
Software & Apps How to manage media files in Apple’s new Music, TV, Podcasts, and Books apps
