I upgraded to Sonoma because my Mac (27" iMac, 3.6 GHz 8-Core Intel Core i9, Retina 5K, 2019) running Ventura started giving me the notification: "[my file] can’t be opened because the original item can’t be found." Guess what? Same thing after I upgraded to Sonoma! While still using Ventura I tried most of the fixes suggested on various sites, none of which worked, so I tried the last option "Upgrade" - so I did and still have the same problem. I can open the folders on my desk top, but when I try from the sidebar I get the error message. I'm no expert but this seems pretty stupid. What gives?