I am running into this issue as well, I hope that Apple has the time (even with the event tonight) to research this issue or communicate what we're doing wrong.
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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.