How to Fix iCloud Drive Syncing Issues on Mac

Resolve iCloud Drive syncing failures on macOS with these precise troubleshooting steps to force data synchronization and refresh your cloud connection.

1. Verify Apple System Status. Navigate to the official Apple System Status page in your browser. Confirm that the status icon next to iCloud Drive is green, indicating the service is operational. If the service is marked as down or under maintenance, wait for resolution before proceeding.
2. Toggle iCloud Drive Sync. Open System Settings and click your Apple Account name at the top of the sidebar. Select iCloud, then click iCloud Drive. Toggle the switch off, wait 30 seconds, and toggle it back on. This forces the background sync daemon to restart.
3. Check Network Connectivity. Click the Control Center icon in the menu bar and verify your Wi-Fi or Ethernet connection. Ensure that no VPN or firewall software is active, as these often intercept and block iCloud synchronization traffic. Disable third-party security software temporarily to test the connection.
4. Force Kill the Sync Daemon. Open Terminal from your Applications/Utilities folder. Enter the command 'killall bird' and press Return. This command terminates the process responsible for file synchronization, which will automatically relaunch and scan your local files against the server state.
5. Monitor Sync Progress. Open Finder and select iCloud Drive from the sidebar. Look for the progress indicator next to the iCloud Drive label or individual file icons. If syncing is active, you will see a pie-chart icon showing the current upload or download progress.