That’s OK. Let’s see if we can get that Dorico folder to show up for you.
Create a new project in Dorico, then when you go to save it, in the Save dialog, expand the menu next to the label Where and see if you have a heading iCloud Library, and below that a folder marked Dorico – iCloud Drive. If you see that, choose that as the location, and save the project in there.
Then take a look in the iCloud Drive folder in the Files app on your iPad: does the Dorico folder appear there now?