Anyone from Apple able to help me?

Same here, @Tobias, FB9681776.

The behaviour probably is correct, if you look at the headers/developer docs for .allowsWriting: /** Indicates that the file can be opened for writing. If set on a folder, this is equivalent to @c .allowsAddingSubItems. */ public static var allowsWriting: NSFileProviderItemCapabilities { get } /**  Indicates that items can be imported to the folder. If set on a file,  this is equivalent to @c .allowsWriting. */ public static var allowsAddingSubItems: NSFileProviderItemCapabilities { get } /** Indicates that the item can be moved to another folder */ public static var allowsReparenting: NSFileProviderItemCapabilities { get } .allowsAddingSubItems/.allowsWriting is the one that defines if you can create a new folder, upload a file to an existing folder, etc if I am correct.