icloud photos missing from mac
Looking for some of my older photos on my mac I noticed that many were blacked out, in one case one whole year's worth. The missing photos appear on my iphone and ipad and they are on icloud. I can't figure out how to force the mac to sync with the cloud for these older photos. Sync with new photos is working just fine between the cloud and all three devices.
Any help would be appreciated.
Mac mini 2018 or later