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[Solved] Could not estimate size of “Photos Library.photoslibrary”. iCloud Photos will not be enabled.

Andy

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Suppose you already have iCloud enabled on another iPhone/iPad or macOS, and now you want to enable iCloud Photos on your Mac, and you get this error message:

Could not estimate size of “Photos Library.photoslibrary”. iCloud Photos will not be enabled.

Here's how to solve it:

Launch the Photos app, and then click on the menu bar: Photos -> Preferences... -> General.
Enable iCloud Photo Library in this panel, and make sure Use as System Photo Library is already enabled as well.

Screen Shot 2021-08-05 at 8.22.39 AM.png



The option Use as System Photo Library should be grayed out.

Screen Shot 2021-08-05 at 8.17.37 AM.png


Now we should be able to enable iCloud Photos (tick on the iCloud Photos), you can select Optimise Storage.

Screen Shot 2021-08-05 at 8.17.53 AM.png


Now we have iCloud Photos enabled on your Mac.

Screen Shot 2021-08-05 at 8.18.04 AM.png


Tested on: macOS Big Sur, version 11.5 (20G71)
If you have any questions or comments, you're more than welcome to post them down below 👇
 
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