Frotz for iPhone not syncing to Dropbox, even though it says the account is linked.

As the subject would suggest, I'm having the issue that Frotz for the iPhone isn't syncing with Dropbox. The account is linked, and I made an account with them--but the sync is not happening. There isn't even a Frotz folder on my Dropbox. I even checked the website, as well as the desktop app, and nothing. I'm stumped. I'd really like to be able to save game saves to my Dropbox, but something isn't going right--and I can't figure out what, if anything, I've done wrong. Any help would be greatly appreciated! Thanks, Shersey