Method 3: Rebuild Library. If the above-mentioned methods fail, you can rebuild the photos library to regain access. To do that, follow the simple steps as follows. Hold down the Option and Command key and click on iPhoto. A dialogue box will appear with a number of repair options. Amazon Photos: Amazon Photos offers unlimited, full-resolution photo storage, plus 5 GB video storage for Prime members. All other customers get 5 GB photo and video storage. Securely store, print, and share your favorite photos from the Amazon Photos app. Keep your memories close at hand on devices like Fire TV, Echo Show, and Amazon Fire tablets. Photos for Big Sur uses reduced-size JPEG versions of photos and videos to display the thumbnails and full screen image views. These versions are stored in the Photos Library package (Right-click Photos Library icon Show Package Contents Resources folder. See this article for some more details). The reason for missing thumbnails might be.

Macos Photos Rebuild Library
Apple Photos Rebuild Library
Photos Rebuild Library Mac
Microsoft Photos Rebuild Library
Rebuild Photos Library High Sierra
Photos Rebuild Library

The first move is to use Apple’s Photos library repair tool. I have all the steps needed to do this outlined in this post.Chance are, this will fix your problem. If not (and in my case it failed.

If iPhoto fails to load or crashes on startup, you may need to repair and rebuild you iPhoto library.

Macos Photos Rebuild Library

To rebuild an iPhoto Library hold down the option and the command key and click on iPhoto to launch the application.

iPhoto will appear with the following dialog box.

Depending on what is wrong with your iPhoto library select one of these options.

Apple Photos Rebuild Library

Repair Permissions

This is probably the best option to start with. If your computer was not shutdown correctly, there may be files that were left open at the time. Repair permission fixes this problem.

Rebuild Thumbnails

iPhoto may have missing or damaged temporary images that iPhoto needs. This option creates those images again.

Photos Rebuild Library Mac

Repair Database

Microsoft Photos Rebuild Library

If the photos in your library don't match what iPhoto thinks it should be, this option will fix that problem. iPhoto looks at what photos are in the library and updates its records accordingly.

Rebuild Photos Library High Sierra

Rebuild Database

Photos Rebuild Library

If nothing else works, use this option. It may take a long time and you might lose information about the photos or albums. Try all of the other options before using this one.