No tracks from Mac USB drive in Sonos music library

If you have a music library stored on an external USB hard drive and are using macOS 10.15 or higher, you may see a “No selections are available” error when browsing the library. This article provides steps to give Sonos the required permissions to access your library and resolve this error.

1. Open System Settings on your Mac.
2. Click on Privacy & Security, then Full Disk Access.
3. Click the toggle next to Sonos Library Server.
4. Open the Sonos app.
5. Update your music library by going to Manage > Update Music Library Now.

Navigate back to the Music Library menu under the Select a Music Source section, and you will now be able to browse your library.