FILES app is not showing in tunes -->Apps --> file sharing on itunes latest software on windows computer ! How to transfer data from computer to device as folder with sub folders & multiple file format ?
Files
AFAIK, the "Files" App can show the local files from the Documents file of other Apps if these have the new key "UISupportsDocumentBrowser" in their Info.plist file. So you do not copy files into the "Files" App via iTunes, the "Files" App is supposed to list local files from other Apps, if these allow this (using the new key for the Info-plist). Unfortunately this is limited to the "Documents" folder of the App, so you can't access files in a shared container of an AppGroup, it seems.