I have an app that's in production over a year. Recently after updating to 11.2.x the pdf documents which are displayed in the app are no longer displaying on the device.
When debuggingin XCode 9.2 using the device the following error is displayed:
2017-12-14 11:31:20.492124-0500 Talking Points[548:93332] [default] Couldn't issue file extension for url: file:///var/containers/Bundle/Application/EBEE8211-E9FC-4975-8AD0-79E02B996231/Talking%20Points.app/ConfidenceintheMail.pdf #PreviewItem
In the simulator using device and samd iOS version they display fine. As well as with 11.1.