System Photo Library
Why can I sync my Photo Library in the Mac to the Photo Library in my iPhone?
iPhone 12 Pro, iOS 14
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Best reply
Is the Photos Library on your Mac your System Photo Library?
- Open Photos on your Mac, if it is not running.
- Open the Photos > Preferences > General and check the item "Use as System Photos Library". If this is not dimmed, click it, to make the library your System Photos Library.
- Check the line "Library Location" in the Photos Preferences. This line is showing you the location of your current Photos Library. Is the library in a supported location, for example the Pictures folder? If your library is on an external volume, the volume needs to be locally mounted, with a USB or thunderbolt connection, not on a NAS or a in a synced folder, like Google Drive or Dropbox. The external volume must not have been used for Time Machine backups.
- Then restart Photos.
- Try to sync again.