Dropbox backup from iOS only

All of the tutorials and explanations for setting up Dropbox seem to assume that files are being shared between different devices/systems. I only use Scrivener for iOS, but I want to back the files up with Dropbox. I have linked the app to my Dropbox account, and a new “Scrivener” folder has indeed been created in Dropbox, but it’s empty. None of my projects have been added to it, and when I press the “sync” button it just says that everything is up to date. How do I send a Scrivener project from iOS to Dropbox without dragging it there from a Mac/Windows machine to start with?

In the project view on your iDevice there are two divisions: on my iPad and On Dropbox. Drag the projects to On Dropbox and you get them there. They exist on you iPad as well in both cases.

THANK you. I knew there must be a simple solution, but I couldn’t see this mentioned anywhere.