Track external file content changes

Question

I've fully implemented the NSFilePresenter protocol using NSFileCoordinator to track external changes made to an imported folder/file tree. And it generally works.

However, I'm still a bit confused.

• I've implemented almost all (if not all) of the protocol's functions.
• presentedSubitemDidChangeAtURL:, presentedSubitemAtURL:didMoveToURL: and presentedItemDidChange are the only ones getting called
• I am able to successfully track new folders being added, or files moving. However when going to track file content changes (edited and saved by another app) things get a bit complicated: The method to be called is presentedItemDidChange (which gets obviously called in other cases as well)

What am I missing?

Shouldn't either presentedItemDidGainVersion: or savePresentedItemChangesWithCompletionHandler: get called?

Any help or pointers are more than welcome! :)