Have a Photos library on your Mac that’s missing previews, won’t open images or videos, or shows a never-changing message loading favorites or uploading images to iCloud Photos? Try rebuilding the Photos library:
Hold down the Command and Option keys while launching Photos.
Click when prompted Repair.
The process can take a significant amount of time for a large library, especially if it’s stored on a hard drive and not an SSD. When this is complete, Photos will load the library and you may be back to normal.
This Mac 911 article answers a question from Macworld reader Kasey.
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