The link is not working anymore, but here is another to the project for future readers: https://github.com/delawaremathguy/CoreDataCloudKitShare It is a very interesting example with a lot of information regarding this topic.

Thanks for this thread. It was probably the most helpful one regarding current CloudKit sharing problems with NSPersistentCloudKitContainer. I hope Apple will fix the problems for next WWDC.

Did you find a solution? Does also not work for me. On my Mac in Terminal I can go the directory and the files are there, but not visible in Finder or the Files app on iOS.