I'd love to be able to access and edit my Dropbox Paper documents offline. Specifically, that would be the most convenient on my mobile phone. I've used a competitive product for years now and having the ability to bring up an itinerary or a confirmation number is very handy. And, I've found myself in situations where I've needed that data, but have not had an internet connection.
I love the way Dropbox Paper works, and I love its features. But, without the ability to work offline, I'm afraid I have to stick with a competitor's product. Sorry.