Locating the iBooks folder in iCloud Drive I'm using iCloud drive to sync my e-books via the iBooks app.

I noticed that the synced files show up in the All My Files view.  I tried to find out their exact location, it seems to be iCloud Drive / iBooks (via Cmd+I) but when I try to navigate there from iCloud Drive, the iBooks folder doesn't show up, even when I turn hidden files on.

Is that a bug or how come this behaviour?
I've been trying to figure out the same thing. I did discover that in terminal you can navigate to the following directory to see your iBooks:

/Users/YourUserName/Library/Mobile Documents/iCloud~com~apple~iBooks/Documents

I have not figured out how to go here in Finder other than the method that you listed.