I'm following the process shown in WWDC 2017 session 229 and makde a UIDocumentBrowserViewController subclass. My app uses a document package and I've created the document type and exported the UTI. I can create a document from the UIDocumentBrowserViewController by clicking the plus button and I've verfied by cd'ing into the Simulator directories that the document is created properly (the directory is created and the files in the directory for the document are created correctly). But when I tap on existing document in the UIDocumentBrowserViewController, the documentBrowser(_ controller: UIDocumentBrowserViewController, didPickDocumentURLs documentURLs: [URL]) method is not called.
Any ideas on what I could be doing wrong?
Thanks,
Dave