Make sure that your software is up to date
Before following any of these steps, it's a good idea to create a backup of your photo library, even if you use iCloud Photos. You can use Time Machine , use a third-party backup solution, or copy the library to an external drive. By default, your photo library is stored in the Pictures folder within your home folder. You can avoid or fix many issues by running the most up-to-date version of macOS.
You might see an alert message when you first open Photos or migrate an existing iPhoto or Aperture library. If you have more than one Photos library—and the one you're using isn't set as the System Photo Library—the Media Browser won't show its contents.
To return to your main Photos library, quit Photos. Then open it again while holding the Option key, select your main library, and click Choose Library.
If Photos opens with the new library, or in a different user account, it might mean that there's an issue with your library. Get help with the Photos app on your Mac If Photos for macOS won't open or isn't performing as expected, try these tips.
Back up your library Before following any of these steps, it's a good idea to create a backup of your photo library, even if you use iCloud Photos. If you have trouble migrating an existing iPhoto or Aperture library to Photos You might see an alert message when you first open Photos or migrate an existing iPhoto or Aperture library. Click the General button at the top of the Preferences window.
Click Use as System Photo Library.
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Create a new Photos library and see if your issues persist: Quit Photos. Press and hold the Option key while you open Photos. In the dialog that appears, click Create New. Give your new library a name, then click OK.
Note whether Photos opens successfully with this new library. Learn more Learn how to create and order print products like books or calendars in Photos with Project Extensions.
Get help with iCloud Photos. Yes No.
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