same for me...even with shouldShowFileExtensions property to true.
Are you able to read the contents of a file?
I am able to read folders picked from "On My iPad", "iCloud Drive", USB drives and SMB shares. The only issue I have is not being able to pick a folder from 3rd party providers like Box, Dropbox, Google Drive, PDF Export, and so on.
All 3rd party providers are greyed out, even though the documentation says: "With iOS 13, users can select a directory from any of the available file providers using a
UIDocumentPickerViewController." I have not found any mention of exceptions to this, so I am at a loss as to if this is an intended limitation, or if there are some additional steps I need to take to enable selecting a folder from a 3rd party provider.
I have been instructed by DTS to file a bug report for this. For anyone else affected by this issue -- PLEASE file your own bug report so this can be properly escalated (e.g. looked at sooner than with only one report): https://feedbackassistant.apple.com