The item couldn't be downloaded. Please check your internet connection, then try again.
I have set up a new MacBook fresh install, signed into my Apple ID account at the setup. I know it takes a while for iCloud Drive to fetch the file and folder structure, but after that I waited forever for it to download everything and it didn't.
When I clicked on the little cloud download icon (or right clicked and chose Download now) I got errors saying "The item couldn't be downloaded. Please check your internet connection, then try again." - I have tried for several folders and it does the same thing.
MacBook Pro (2020 and later)