One year later, but I have exactly the same problem with 11.4. Pretty sure it is related to iCloud but I can not work with a 3000$ laptop. This is driving me completely nuts and it will be the first reason I switch outside the Apple ecosystem. I literally can not use a 3 grands machine for moving documents into folders.
lposani
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution