Unable to Add Local Music to Apple Music on My Computer

Music cannot import files in FLAC format. Music will silently reject what it sees are improperly formated files. These may include files with a format that doesn't match their extension, even if such files might play in QuickTime.

See also Repair security permissions for iTunes/Music for Mac - Apple Community.

Try copying the files you want added into the Automatically Add to Music folder inside your media folder. They will either be absorbed into the library, or moved into a Not Added folder. If they end up there you will know for sure that Music doesn't consider them to be valid media files.

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"Unable to Add Local Music to Apple Music on My Computer: I do have an active Apple Music subscription. Streaming songs and playlists work fine for me, and I can also download them and sync them to my iPhone without any problem. The issue is only with adding local music files on my Mac — they just won’t show up in my library."

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A. Redownload Purchased Music:

So, this is all home music (mp3 files), correct? Or are these iTunes Store purchases?

Try Redownloading these:

• Redownload Music from the iTunes Store on your iPhone or iPad - Apple Support
• Redownload Music from the iTunes Store on your Mac - Apple Support

B. Restart your Mac

C. Log Back into Apple Music:

Log out of Music, and then log back in.

D. Authorize this Computer:

1. Open: Music app
2. Click: Account
3. Click: Authorize this Computer...

"Unable to Add Local Music to Apple Music on My Computer: [...]I want them to appear in my Apple Music library so I can organize and play them, but they won’t show up.[...]"

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Adding Music to Apple Music Library:

So, do you have an Apple Music Subscription? If not, then it is just not going to show across all of your devices; and the same goes for playlists of these items.

Viewing your Subscription Plan on your Mac:

1. Open: App Store app
2. Click: your name in the sidebar or Sign In if not seen)
3. Click: Account Settings.
4. Sign In: if prompted)
5. Scroll: Subscriptions
6. Click: Manage