I am also getting this error with the Mac mini Apple Silicon. How to proceed now?

No. I am sorry to say to Etresoft, this has NOT been always like this. With the above call I have been able UNTIL macOS 11 to present the user (for selection) the bookmark files of browsers in the ~/Library folder, but this is now broken in macOS 11. My app has been sandboxed for several years now (necessary for Mac App Store).

In the WWDC videos that promotes the UIDocumentBrowserViewController, an evangelist is not mentioned. However, persons the persons below who performed in the WWDC videos can perhaps comment on why App Review is now blocking use of their UIDocumentBrowserViewController? Brandon Tennant, Thomas Deniau, Rony Fadel, Pau Sastre Miguel, Raffael Hannemann, Maxime Uzan Many thanks, Alco Blom

I just realised that even switching from UIDocumentBrowserViewController to UIDocumentPickerViewController won't work, because the UIDocumentPickerViewController also allows you to Share and Delete files (and App Review objects to that).

The App Review board looked at it again, and now they say: "it launches directly into the management capabilities of the user's iCloud Drive" The fact is that Apple itself, for Document-based apps, advices to launch into the Document Browser. You can see this in the Xcode template "Document-based app" and several WWDC videos. The reviewers just do not seem to be aware of Document-based iOS apps. I can't believe that nobody from the developers at Apple (the developers of UIDocumentBrowserViewController) have anything to say about it... In my opinion they should schedule a meeting with the App Review Team and educate them about Document-based apps.

I have now my app URL Manager Pro for iOS in the App Store but WITHOUT the Document Browser or Document Picker. https://apps.apple.com/app/url-manager-pro/id449825241 I instruct my users now to tap on their documents in the Files app to open them. Is there nobody from the Apple developers who can advise my how to get the Document Browser or Document Picker in my app without being blocked by App Review?

OK. It seems the issue is now solved and we do can use the Document Browser or Document Picker.

At some point (I don't remember when), it started to act again like before. Perhaps Apple put something in only for my app URL Manager Pro... I don't know. I never got a reply or response from Apple.