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.
HeGer
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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.