

If you have only one photo library, as most folks do, it’s the System Photo Library. Plus, some Apple apps and third-party apps also access your System Photo Library using the Media Browser. You can also sync them to iOS devices and Apple TV via iTunes. If you want to use your own images as your desktop picture or screen saver, the images need to be in your System Photo Library before you can select them in System Preferences. You can create multiple photo libraries on your Mac, but you have to choose one to be THE System Photo Library. Photos in it are available in apps like iMovie, Pages, and Keynote. You’ll need to properly manage them, including taking steps to make sure you don’t run out of local storage. If these steps don't work or you can't open the repair tool, contact Apple Support.When you first use Photos, you create a new library or select the library that you want to use. If you repair a library that's used with iCloud Photos, iCloud checks the library after the repair process completes to ensure everything is synced correctly. When the process is done, Photos opens the library. Depending on the size of your library, the repairs might take some time. The Repair Library tool analyzes the library's database and repairs any inconsistencies it detects. You might be asked to enter your user account password. In the window that opens, click Repair to start the repair process.Then, while you click to open Photos, hold down the Command and Option keys at the same time. To get to the Photos Repair Library tool on your Mac, follow these steps: By default, your photo library is stored in the Pictures folder within your home folder.

You can use Time Machine, use a third-party backup solution, or copy the library to an external drive. Before you use the Photos Repair Library tool, back up your photo library.
