iPadOS 13.1 beta 1. I am able to open a shared network folder (windows 10) in the files app and see the list of files, but tapping on a PDF file does nothing. If I long press on the file name I get a menu with copy, duplicat, info, quick look but none of them open the file for viewing. Info shows file information and has an open button, but the open button does nothing. Quick look shows a gray window with the title of the file but not the pdf contents.
i Am able to direct open pdf files from dropbox folders.