"Photos was unable to make a copy of your library before preparing it. Photos does not have the necessary permissions..."?
My full library is on an external hard drive. I am now receiving this alert. How do I solve it?
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Select the volume icon in the Finder and open the Info window. Click the padlock icon in the lower right corner of the window and enter your administrator password when prompted. Check the box at the bottom marked
Ignore ownership on this volume
Close the Info window.