Over Thanksgiving, my aunt asked for help with her Mac.
At some point, she must have enabled iCloud Drive including Documents and Desktop, then disabled it and I suppose checked the “keep copy on Mac” when disabling.
So she had both local and iCloud versions of the Documents and Desktop folders, with documents in both locations. De-duping these and moving everything back to her Mac was such a gargantuan task it will have to wait for another day.
Try as I might, I was unable to explain to her how Documents/Desktop folders on her Mac and the Documents/Desktop folders in iCloud differed. Compounding the situation, some of the files in the iCloud folders had local copies on the Mac and some were only in iCloud since the “Optimize Mac Storage” option was enabled.
Separately, I had trouble explaining to her how opening the Desktop folder in a window and her actual Desktop were different views of the same folder.
On top of that, with iCloud, there are application specific folders for those apps documents which I think predate Apple adding the Files app to iOS. So for example, by default Numbers will prompt you to save a new document in its Numbers folder and not in the Documents folder.
She also didn’t understand why iCloud Drive included just the Documents and Desktop folders and not, say, the Downloads folder. Or how “iCloud Drive” differed from iCloud itself.
It’s all become a terrible confusing mess.