DocumentPicker in Files App on iOS

Hi guys!

I had a look into the Files (Dateien) - App on my iPhone/iPad and there is an entry called “DocumentPicker” listed as a possible location to save or access files. But I cannot look into the content of the folder weather I have cryptomator open a vault on my iCloud-Drive or not. It does not make a difference. But why then displaying this location in the Files-App, when the only way to access the encrypted files is via the Cryptomator app?

Thanks a lot!