Photos missing on iMac after upgrade to Monterey
After upgrading my 2017 21-inch 5K Retina iMac to Monterey, 99% of my photos are no longer showing up on the computer. How do I retrieve the photos?
iMac 27″ 5K, macOS 12.0
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Is it currently syncing with iCloud? (What does the status say at the bottom of the all photos view?)
Alternatively it is possible you are opening an empty Monterey library and all your photos are still safe in your old library. Hold down the option key while starting photos. Is more than one library listed? If so, open each in turn to see if they contain your missing photos. Note that if you open a library from an ealier macos - there may be a delay while it is upgraded.
If you didn't take a backup of your system before upgrading, then it is also advisable to do it now before letting Monterey upgrade your old library.