iPhone/iPad Sync Issues on macOS Catalina: Fixes

If your iPhone or iPad won’t sync with macOS Catalina, the fix usually involves re-authorizing your computer, checking USB/connection settings, or updating both devices. Below are the most effective troubleshooting steps to get syncing working again, based on common Catalina-specific problems.

Why Catalina Changed Syncing

macOS Catalina (10.15) replaced iTunes with separate apps: Music, TV, and Podcasts. Device syncing moved into the Finder sidebar. This means the old “trust this computer” prompt and sync settings are now handled by Finder, not iTunes. Many users are confused because they still look for iTunes, which no longer exists on Catalina. If you haven’t opened Finder and selected your device, you’re likely missing the entire sync interface.

Check Your Connection First

Before diving into software settings, verify the physical and logical connection:

• Use an Apple-certified Lightning or USB-C cable. Third-party cables sometimes only charge and don’t carry data.
• Try a different USB port on your Mac, preferably one directly on the computer (not a hub or keyboard).
• Unlock your iPhone/iPad. If the screen is locked, the Mac may not see it.
• If you see a “Trust This Computer?” alert on your device, tap Trust. If you already tapped “Don’t Trust,” go to Settings > General > Reset > Reset Location & Privacy, then reconnect.

Enable Wi-Fi Syncing (and Check It)

If you prefer wireless syncing, it must be enabled while the device is connected via cable first. Once enabled, your device appears in Finder even when not plugged in. To check or enable:

1. Connect your iPhone/iPad with a cable.
2. Open Finder and select your device under Locations in the sidebar.
3. Scroll to the Options section and check “Show this iPhone/iPad when on Wi-Fi.”
4. Click Apply. Then disconnect and test wireless syncing.

If Wi-Fi syncing was previously working but now fails, toggle it off, click Apply, then toggle it back on and Apply again. This often resets the connection.

Update macOS and iOS

Apple regularly patches sync bugs. Ensure both your Mac and your iPhone/iPad are running the latest versions:

• On Mac: Apple menu > System Preferences > Software Update.
• On iPhone/iPad: Settings > General > Software Update.

If an update is available, install it. Many Catalina-era sync issues were fixed in later 10.15.x updates and in Big Sur and newer. If you’re still on an early Catalina build (like 10.15.0 or 10.15.1), updating is the first thing to try.

Reset the Sync History and Media Folders

Sometimes the sync database gets corrupted. You can reset it without losing your data:

1. Disconnect your device.
2. In Finder, go to Go > Go to Folder (Shift+Command+G).
3. Type ~/Library/Application Support/MobileSync/Backup and press Return. This folder contains your backups—do not delete it unless you want to lose them.
4. Instead, go to ~/Library/Application Support/Finder and look for a file named iPodDevices.plist. Move it to the Desktop (as a backup) and restart your Mac.
5. Reconnect your device. Finder will treat it as new and rebuild the sync list.

If that doesn’t help, you can also delete the com.apple.finder.plist file (but this resets all Finder preferences, so back it up first).

Check for Conflicting Software

Third-party apps that manage iOS devices (like phone managers or backup tools) can interfere with Finder’s sync. If you have any such software, temporarily quit it and try syncing again. Also, check if your Mac’s security software (antivirus or firewall) is blocking the connection. You can temporarily disable the firewall (System Preferences > Security & Privacy > Firewall) to test, but re-enable it afterward.

When All Else Fails: Erase the Sync Settings

If you’ve tried everything and still can’t sync, you can reset the sync settings on your iOS device:

1. On your iPhone/iPad, go to Settings > General > Reset.
2. Tap Reset Location & Privacy. This clears the “Trust” settings for all computers.
3. Reconnect to your Mac and tap Trust when prompted.

This often fixes the “device not recognized” issue. If you still have problems, try a different cable or a different Mac to isolate the issue.

Frequently Asked Questions

Why doesn’t my iPhone show up in Finder on Catalina?

First, make sure your device is unlocked and you’ve tapped “Trust” on the phone. Then check the Finder side—your device appears under Locations, not in the sidebar’s “Favorites.” If it’s still missing, try a different cable or port, and restart both devices.

How do I sync music on Catalina without iTunes?

Open the Music app. Connect your device, select it in Finder, then click the Music tab. Check “Sync music” and choose either the entire library or selected playlists/artists. Click Apply. You can also manage music manually if you uncheck “Sync music” and drag songs directly.

Can I still use iTunes on Catalina?

No, iTunes is removed in Catalina. Apple split its functions into Music, TV, Podcasts, and Finder. If you need the old iTunes interface, you can run an older macOS on a separate volume, but that’s not recommended for daily use.

Why does my Mac say “Cannot sync because the device is not authorized”?

This usually means your Mac is not authorized for your Apple ID. Open the Music app, go to Account > Authorizations > Authorize This Computer, and sign in with your Apple ID. Then try syncing again.

Does syncing erase my iPhone data?

No, syncing adds content (music, photos, etc.) to your device. It does not erase personal data like contacts or messages. However, if you choose “Erase and Sync” in the Finder options, it will replace the selected content with what’s on your Mac. Always back up before using that option.

Why does my iPhone sync but not show all my photos?

In Catalina, photo syncing is handled by the Photos app, not Finder. Open Photos, go to Settings > Photos, and check “Sync Photos” and choose “All photos” or selected albums. Also ensure your iPhone has enough storage—if it’s full, sync will fail silently.

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