UIDocumentPickerViewController in export mode delegate method called after export done.

I am using UIDocumentPickerViewController for transferring folder in export mode. The transferring of folder is working on selected folders. Now I want to restrict some target folders.

But didPickDocumentsAtURLs is getting called after actual transfer. Any idea how can we restrict it?

UIDocumentPickerViewController in export mode delegate method called after export done.
 
 
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