Photos library won’t load? Time to rebuild it. Here’s how

Have a Photos library on your Mac that is missing previews, won’t open images or videos, or displays a never-changing message that it’s loading favorites or uploading images to iCloud Photos? Try rebuilding the Photos library:Quit Photos.Hold down the Command and Option keys while launching Photos.When prompted, click Repair.Click Repair and be prepared to wait.The process can take a substantial amount of time for a large library, particularly if it’s stored on a hard drive an