When viewing the documents in a group, there is a “hamburger” button in the lower right corner of the screen. Tapping it opens a “View options” menu. The popup menu has buttons: Name, Kind, Date, Size as well as Ascending and Descending. This would seem to control sort order. However, it doesn’t appear to do anything.
More importantly to me, on my Mac I have a group which contains documents which are manually sorted. How can I maintain this sort order on my iPhone/iPad? Can I sort documents manually on my mobile device?