Photos Shared Albums Have NEVER Worked Properly

I created a new shared album, invited users, they added photos. The added photos are not visible on ANY other Apple device signed in with the same AppleID nor can any other shared user see them. What gives? Oh and I've tried every trick in the Apple Community forums too. NOTHING! I have never gotten them (Shared Albums) to work properly for over a decade now. Why? I think Apple needs to delete it from iOS, iPadOS, and MacOS until you get it right. That's the way you used to do things.