I am having the same file problem with my App. The app directory is not showing up in the Files app - Location On My iPhone. There should be a folder with my App name listed. I am running iOS 18.3.1 on iPhone 15. I have restarted the iPhone and it did not fix the issue. I have also tried running it on the iPhone 16 simulator with the same negative results. I have added the three keys as suggested.

<key>LSSupportsOpeningDocumentsInPlace</key>
<true/>
<key>UIFileSharingEnabled</key>
<true/>
<key>UISupportsDocumentBrowser</key>
<true/>

` I can write files to Apps Document directory. Any other ideas why the App file directory is not visible? An alternative solution, it should be possible to write the files directly to iCloud? I will keep testing.