Mac Photos does not sync with iCloud
My Mac does not sync with my photos on iCloud.
The pictures that I take with my phone and my iPad are uploaded on iCloud (I can see them on the iCloud.com site). The synchronization happens seamlessly between the iPad and the iPhone.
The issue seems related to the Mac.
All boxes are ticked and I am logged on with the same Apple Id profile on the Mac as on the phone and Ipad.
On the Mac, Photos states "uploading 5658 items" when I scroll down to the bottom of the Library. It offers to "pause" the uploading process. I tried to pause and resume with no effect.
It seems "stuck" in the uploading process and it doesn't download anything.
Help would be appreciated !
Mac mini 2018 or later