How to Fix Music That Won't Play Offline on iPhone

"Offline" is one of those words that only gets tested at the worst possible moment — seat 24B, doors closed, four hours of nothing ahead. This guide is about finding out before then, and about reading the specific thing your phone is telling you rather than guessing.

Almost every case of music that won't play offline is one of five problems, and they have different fixes. The trick is telling them apart.

First: test it properly

Do this on the ground, not in the air.

1. Open Control Center and turn on Airplane Mode.
2. Play several albums from different parts of your library — old imports and recent ones, big albums and single songs.
3. Write down which ones fail, and what the app said when they did.

That pattern is the whole diagnosis:

• Everything fails → the music was never imported. Case 1.
• Some songs fail with "can't be found" → the files are missing. Case 2.
• Some songs were never in the library at all → the import dropped them. Case 3.
• The library came up empty or reset → Case 4.
• Only your Apple Music songs fail → Case 5, and it isn't fixable.

Case 1: the music was never imported

By far the most common cause, and the least obvious, because from a distance "the songs are in an app on my phone" looks the same either way.

A file in iCloud Drive, Dropbox, or Google Drive may only be a placeholder — the real file lives in the cloud and gets fetched on demand. It plays perfectly at home. It plays not at all at 30,000 feet.

Streaming services are the same story with different branding: a Spotify or Apple Music "download" is available inside that app under its own rules, and nowhere else.

The fix is to import the music, which copies it onto the device:

• From a computer, over Wi-Fi: transfer music without iTunes
• From the Files app or a cloud drive: play music from the Files app
• From a USB drive: play music from a USB flash drive

How to confirm: open the Library tab. If a song isn't listed there, it isn't in the library, and nothing about the network will change that.

Case 2: "Couldn't Play Song"

If you see this alert —

Couldn't Play Song "Song title" can't be found — it may have been moved or deleted. Add it again from Add Music on Home.

— the song is still listed in your library, but the audio file behind it is gone. The listing points at something that isn't there anymore.

The alert offers Remove from Library, which deletes the dead listing (not any audio), and OK, which leaves it alone. Playback skips past the song either way rather than stopping the queue; if every remaining song in the queue is missing, you'll get the plural version instead.

What causes it:

• A device restore that brought your library back without the audio files.
• An interrupted rebuild after a library reset.
• App storage cleared by something outside the app.
• A very old import whose file was later removed by hand.

The fix is to import the affected music again from Add Music on the Home tab, then use Clean Up Missing Files (below) to clear out anything still pointing at a file that isn't there.

Case 3: songs that failed to import

Sometimes the music isn't missing — it never arrived. Imports report per-song failures rather than dying silently, and each message maps to a specific fix.

What the app says	Cause	Fix
Download it in Files (or Finder), then try again	An undownloaded cloud placeholder	Download it in the Files app, then re-import
This song is copy-protected and can't be imported	An Apple Music streaming download, or another copy-protected file	Not fixable — see Case 5
Make sure the file is a supported audio format	Not a format we play (.wma, .ape, and friends)	Convert on a computer first
Free up storage, then try again	The device ran out of space	Free space, then re-import
Choose the file again in Files, then try again	The permission to read that location expired	Re-select it in the picker
Download the song in the Music app, then try again	The song is in your Apple Music library but not downloaded	Download it in Apple's Music app first

Supported formats, for reference: MP3, M4A, AAC, FLAC, WAV, AIFF, CAF, MP4, OGG, and Opus — imported as they are, with no conversion step. See formats and lossless for the detail.

A large import that seems to have skipped things is worth re-running: the duplicates setting defaults to Skip Existing, so a second pass only adds what's genuinely missing and costs nothing but time.

Case 4: "Couldn't Open Your Library"

Rarer, and more alarming than it needs to be. If your library itself can't be opened, Prismatic starts a fresh one rather than refusing to launch — and then tells you, with the count of what it found still sitting on the device:

Couldn't Open Your Library Your library was damaged, so Prismatic started a new one. Your 1,284 songs are still on this device and can be added back.

Tap Rebuild Library and it scans the audio still on the device and puts it back into a working library. Not Now defers — and deliberately keeps the offer, so it returns next launch rather than stranding your files.

You may instead see a quieter version:

Add Missing Songs? 312 songs from an earlier library are still on this device. Prismatic can add them back.

Same idea, smaller scope: some music is still on the device but isn't in your current library. Add Songs brings it back.

Two notes on this. A rebuild recovers songs; it can't recover playlists or play counts, which were part of the library that was lost. And if you're moving between devices, a device-to-device transfer carries playlists and play counts, which no rebuild-from-files can.

Case 5: Apple Music downloads

This is the one with no fix, so it's worth being direct.

Songs downloaded from the Apple Music streaming service are copy-protected. Apple does not permit any third-party app to play them — Prismatic Music included, and every competitor too. They can't be imported, they can't be converted, and an app that claims to play them is describing something it cannot do.

What does work is music you own:

• iTunes Store purchases (including ones bought years ago)
• CDs you ripped
• Bandcamp, Qobuz, and other store downloads
• Promos, DJ pools, your own recordings

That's the honest boundary of the offline-player category, and it's the reason a library you own behaves so differently from a subscription. See the offline music player, explained.

Clean Up Missing Files

Once you've fixed the underlying cause, there may still be dead listings left in the library — songs that show up in lists and fail when tapped.

Open Settings → Library Management → Clean Up Missing Files. It scans your library, lists every song whose audio file can't be found, and offers to remove them. The app is explicit about what it does:

These songs' audio files can't be found — deleted, moved, or on a disconnected drive. Removing them just tidies your library; no audio files are deleted.

Do it after re-importing, not before. If you clean up first and then import, you get the same songs back, freshly listed — no harm done, just a longer route.

While you're here: Find Missing Artwork fills in covers for albums that imported without them, and Clear Library permanently deletes everything — songs, playlists, artwork, and imported audio files. That last one is not a troubleshooting step. Reach for it only when you intend to start over.

A checklist before you fly

Ten minutes the night before beats four hours of silence.

1. Import everything you want — and do it on Wi-Fi, not on the way to the airport.
2. Turn on Airplane Mode and play a song from three or four different albums, including the newest imports.
3. Check the newest import specifically. Recent additions are where failures cluster, because they haven't been tested by ordinary listening yet.
4. Run Clean Up Missing Files if anything failed with "can't be found".
5. Check your storage. An import that ran out of space mid-way leaves a partially imported album, which looks fine in a list.
6. Queue up what you'll actually listen to while you still have signal, so you're not browsing a library in the dark at row 24.

Do that once and the flight version of "offline" and the home version finally mean the same thing.