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:
Hold down the Command and Option keys while launching Photos.
When prompted, click Repair.
The process can take a substantial amount of time for a large library, particularly if it’s stored on a hard drive and not on an SSD. When complete, Photos will load the library, and you may be back to normal.
This Mac 911 article is in response to a question submitted by Macworld reader Kasey.
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