After updating to 13.5.1, secured folder won't open
I alllowed my M1 MacBook Air to upgrade to 13.5.1, now my secured folder won't open. I know the password because I've used this folder almost daily for years. How do I get this folder to open again? There is a lot of information in there that I need. I have used Time Machine and I restored a backup from before I upgraded and it fails to open also. Help!
MacBook Air 13″, macOS 13.5