Apple Music Sync Library: How to Turn It On [Troubleshooting]

Part 1. What Is Apple Music Sync Library & How Does It Work?

Apple Music Sync Library (formerly known as iCloud Music Library) is a feature that keeps your music collection available across all devices signed in with the same Apple Account. Once enabled, your songs, albums, playlists, and personal music files can automatically appear across your iPhone, iPad, Mac, Apple TV, Apple Watch, and Windows PC.

Sync Library does not work as a traditional cloud backup. Instead, Apple uses iCloud to keep your Apple Music library information synchronized, including matched songs, uploaded music, playlists, and library changes.

Key Features of Sync Library at a Glance

• Unified Access: Combines tracks from Apple Music's catalog, your iTunes purchases, and personal audio files uploaded from your computer.
• Real-Time Cross-Device Syncing: Creating playlists, adding albums, or deleting tracks on your iPhone immediately updates your Mac, iPad, Apple Watch, Apple TV, and Windows PC.
• Cloud Storage: Eliminates the need to manually transfer music files using USB cables.

Part 2. How to Turn On Sync Library on Apple Music Across Devices

Want to access your favorite playlists, albums, and imported tracks no matter which device you are using? Enabling Sync Library is the key to keeping your entire Apple Music collection perfectly unified across your iPhone, iPad, Mac, and PC. Here is how to get started.

Part 3. Why Is Sync Library Apple Music Not Working

Apple Music's Sync Library feature is designed to work seamlessly in the background, keeping your playlists, albums, and imported tracks unified across all your devices. However, when songs fail to appear, playlists refuse to update, or the sync gets stuck, it can be incredibly frustrating.

Before diving into the settings, it helps to understand why this happens. Most syncing issues boil down to account mismatches, subscription status, network hiccups, or software bugs. Here is a comprehensive guide to diagnosing and fixing your Apple Music Sync Library.

Common Reasons of Apple Music Sync Library Not Working

1. Your Subscription Expired: Sync Library requires an active Apple Music or iTunes Match subscription. If your payment failed or your plan expired, syncing stops immediately.
2. Mismatched Apple Accounts: Your library will only sync across devices signed into the exact same Apple Account. If your Mac is on a work Apple Account and your iPhone is on a personal one, they won't communicate.
3. Sync Library is Disabled on One Device: Syncing must be turned on individually for every device. If it's on for your Mac but off for your iPhone, your mobile library will look incomplete.
4. Network Issues: Syncing relies heavily on iCloud. A slow or unstable Wi-Fi or cellular connection will cause tracks to get stuck "waiting" to upload or download.
5. Outdated Software: Running older versions of iOS, macOS, or the Apple Music app can cause compatibility glitches that break background syncing.
6. Problematic Audio Files: Extremely large libraries take a long time to sync. Furthermore, unsupported audio formats, corrupted local files, duplicate tracks, or broken metadata can stall the entire process.

Tested Setup: Apple Music Sync Library Troubleshooting

To understand common Apple Music Sync Library problems, we tested the feature across multiple devices:

Common issues observed during testing included:

• Playlist changes appearing on Mac but not iPhone
• Sync Library option disappearing
• Songs showing as unavailable
• Library updates taking several hours
• Different devices showing different music collections

Part 4. How to Fix Apple Music Sync Library Not Working

After identifying possible causes, you can follow these step-by-step troubleshooting solutions to restore proper synchronization across your devices:

1. Verify Your Apple Music Subscription Status

The first step is ensuring your Apple Music or iTunes Match subscription is active. Without a subscription, Sync Library won't function.

On your iPhone/iPad:

1. Open Settings.
2. Tap [Your Name] at the top and go to Subscriptions to check your Apple Music subscription status.

On Mac/PC:

1. Open Music app on your computer.
2. Click on Account > Account > Manage and check your subscription details.

2. Confirm Apple Account Alignment

Double-check that your iPhone, Mac, and PC are all logged into the same Apple Account. On iOS, check under Settings > [Your Name]. On Mac/PC, check under Account in the top menu bar.

3. Toggle Sync Library Off and On On All Devices

Force-refreshing the cloud connection often resolves temporary syncing loops. You can refer to the complete steps in Part 2 to do this.

4. Check Your Internet Connection

A weak or unstable internet connection can disrupt the Apple Music playlist syncing process. Make sure you're connected to a stable Wi-Fi network or have sufficient cellular data.

• Switch to a different Wi-Fi network if available.
• Try toggling Airplane Mode on and off to reset the connection.
• Ensure cellular data is enabled for Apple Music under Settings > Music > Cellular Data.

5. Re-Authenticate Your Apple Account

Signing out of your Apple Account and signing back in can refresh your account and resolve Apple Music syncing problems.

On iPhone/iPad:

1. Go to Settings > [Your Name].
2. Scroll down and tap Sign Out.
3. Sign back in with your Apple Account.

On Mac/PC:

1. Open Apple Music app.
2. Go to Account > Sign Out.
3. Sign back in with your Apple Account.

6. Clean Up Oversized Playlists or Corrupted Files

If a specific playlist fails to update, try splitting large playlists (1,000+ songs) into smaller segments. Besides, Corrupted files or duplicates can act as a roadblock for the sync engine. Look for songs that are grayed out, refuse to play, or lack artwork. Delete the problematic tracks from your library and re-add them.

7. Check Your Local Storage Space

Even though Sync Library lives in the cloud, your device needs local storage to manage metadata, cache files, and download tracks.

• iPhone/iPad: Check Settings > General > iPhone Storage.


• Mac: Check System Settings > General > Storage.

If your device is completely full, delete unused apps or media to give Apple Music room to breathe.

8. Give It Time

If you just enabled Sync Library on a collection with thousands of imported MP3s and Apple Music tracks, it is not going to finish in five minutes. Plug your device into a charger, connect to a strong Wi-Fi network, open the Music app, and let it run overnight.

Part 5. How to Back Up Apple Music Library Locally and Sync Anywhere

Apple Music Sync Library is convenient for accessing your music collection across Apple devices, but it is not designed to be a permanent backup solution. If your Apple Music subscription ends, some Apple Music tracks may no longer be available. Likewise, Sync Library does not provide a traditional folder containing your songs that you can freely move to any device.

For users who manage large music collections, create personal archives, or want more flexibility with playback devices, keeping a separate local Apple Music backup can provide additional protection. You can use third-party software like DRmare Apple Music Converter to convert and back up your Apple Music playlists locally on your computer. It allows you to 30X convert Apple Music tracks to MP3, AIFF, FLAC, and other formats with lossless quality. It ensures 100% lossless sound quality and complete ID3 tags. This way, you can sync and access your Apple Music across devices even if your subscription ends.

How to Convert and Sync Apple Music Library Without Subscription

Step 1Add Apple Music files to DRmare Apple Music Converter

Click the "Download" link to install the free trial version of DRmare Apple Music Converter. Then open it and you will see the integrated Apple Music Web Player. You can then click the "Add" > "Add to List" button to select and import them from your music library to the conversion queue.

Step 2Customize Apple Music output format

You can reset the output format and other parameters before converting Apple Music. To do this, click the "Menu" > "Preferences" > "Conversion" button to select the desired output format, sample rate, audio rate, etc. Then click the "OK" button to apply the changes.

Step 3Download and back up Apple Music anywhere

Click the "Convert" button and it will batch convert all the Apple Music songs you added at 30X speed. When it's over, you'll have a copy of Apple Music on your local drive. You can find them in your computer's folders by clicking on the "Output" folder. Or, you can directly click the "Converted" tab to find and listen to Apple Music offline. Now, you can connect your device to your computer and sync Apple Music downloads to it without any problem.

Part 6. In Conclusion

Apple Music Sync Library remains the easiest way to keep your music collection available across iPhone, iPad, Mac, and Windows devices. Once enabled, your playlists, albums, and added songs can stay synchronized without manual transfers. However, Sync Library is designed for convenience rather than permanent storage. It depends on your Apple Account and Apple Music subscription, and it does not replace a true backup system.

For everyday listening, Sync Library is the best choice. For users who want additional control over their music collection, maintaining a separate local backup can provide extra flexibility. By combining Sync Library with a reliable backup strategy, you can enjoy your Apple Music collection with fewer syncing issues and greater control over how your music is managed.