Wont connect to Dropbox

I sync all my devices using Dropbox, and PAID for this app because it supposedly connects with Dropbox. But whenever I try to open Dropbox from this app on my iPhone 6 Plus, the app crashes. I reported this months ago but the developers have done nothing about it.

GrandpaOtto about Documents Unlimited Suite for iPhone - Editor for OpenOffice and Microsoft Office Word & Excel Files