how to turn on photo stream on my mac
How do I turn on photo stream on my new MacBook Pro?
MacBook Pro (2020 and later)
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Open the Photos app, click Preferences on the Photos menu, click iCloud at the top of the Preferences window.
Note that the Photo Stream option isn't available on a Mac if iCloud Photos is turned on. Also note the following from My Photo Stream - Apple Support
If you recently created your Apple ID, My Photo Stream might not be available. If My Photo Stream isn't available, use iCloud Photos to keep your photos and videos in iCloud.