macOS users may notice that the Engine DJ Sync Manager is unavailable or greyed out when they go to sync files with their drive. Or, they may either have no access to any functions within the sync manager or are unable to access any connected drives.
As is common these days, macOS security options are evolving and the Engine software may need to be enabled permission to access your hard disk and/or external drives before any files can be transferred. If this is not done when prompted during installation (options could have also changed during an OS update), it's easy to go into the macOS system settings and update the permissions.
Restart Engine DJ and you should now have full access to the Engine DJ Sync Manager and your external drives.