You need to reactivate it in the Photos preferences. The update to Big Sur appears to turn it off, probably because Apple wants people to use iCloud Photos.After updating to Big Sur my Photostream album no longer shows in the Photos app. I see it on other devices and all devices are logged into the same AppleID. Am I missing something? Or is hidden somewhere else?
Thanks
Thanks for your advice. It worked! My Photo Stream hasn't worked on my New Mac Mini M1 since I got it few days ago until now.I have no idea if this will help, but try repairing the Photo Library: https://support.apple.com/en-us/HT204967
It's not as dramatic as it may sound and I have done it a few times for other reasons with positive outcomes.