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 Preferences on your Mac.
2. Click on Security > Privacy.
3. Under the Privacy tab, click on Full Disk Access.
4. Check the box next to Sonos Library Server.
5. Open the Sonos app.
6. Update your music library by going to Manage > Update Music Library Now.

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