So, after I upgraded to macOS High Sierra 10.13, the Photos app updated and iMovie no longer attached it in the Library. What I had to do is to set “Use as system photo library” in the Photos preferences, but it was grayed out. In order to reset this, I had to launch Photos with the option key pushed and a menu will come up, create a new library. After created a new library, open it up go to preferences, set Use as system photo library and the new one shows up in the iMovie. Now, I open the original Photo Library with Photos, go to preferences and the option Use as system photo library available, set it and my old Photo Library appear again in iMovie. Delete the new library.

Use As System Photo Library Grayed Out Mac

Use As System Photo Library Grayed Out

Use As System Photo Library Grayed Out Mac Screen

Jun 10, 2020 Here is how: Open the library (open Photos while pressing the Option key and then select the library). Click Photos Preferences. Click the General tab. Click Use as System Photo Library. Repair Library tool. You can use the Photos library repair feature to fix this problem. The Photos Library is greyed out if you attempt to open it from iPhoto. Any changes you make to the iPhoto Library will not be reflected in the Photos Library, meaning you'll gradually go out of sync until such time as iPhoto no longer works (OS X 10.11, who knows?) & you'll need to reimport at that time.