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Unsure if this is still an issue, but you could try a repair, and should backup the library:<br><br><a href="https://help.apple.com/photos/mac/1.0/index.html#/pht6be18f93" rel="ugc">https://help.apple.com/photos/mac/1.0/index.html#/pht6be18f93</a>
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Unsure if this is still an issue, but you could try a repair, and should backup the library:

https://help.apple.com/photos/mac/1.0/index.html#/pht6be18f93 [https://help.apple.com/photos/mac/1.0/index.html#/pht6be18f93]

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I have a client with a MacBook Air with Catalina v 10.15.13. When selecting the Photos checkbox to sync, the check remains for a second then disappears. All other iCloud options are functioning.<br />
<br />
Any suggestions to fix would be appreciated.
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I have a client with a MacBook Air with Catalina v 10.15.13. When selecting the Photos checkbox to sync, the check remains for a second then disappears. All other iCloud options are functioning.

Any suggestions to fix would be appreciated.

iCloud Photos Sync Check Box won't stick

Programs written for the Apple operating systems are distinguished from software created for other operating systems in that it must be approved by Apple for use on its devices, whether it is from Apple (Final Cut, iWork, Keynote, Logic Pro and GarageBand are popular titles), or is a third party application from Parallels, Nuance, Microsoft and Amazon, among many others.

Apple Software

Mac OS X is the desktop operating system from Apple Inc., found on Macintosh computers. OS X consists of a Mach/BSD-based kernel, operating system interfaces primarily based on FreeBSD and additional frameworks (written in C, C++ and Objective-C providing user interface and application-level services.