We actually started with a single folder but the UX wasn't great. It meant that everyone had to drag their existing projects and files into a specific Marvel folder in Dropbox/apps.

After we saw that no one was doing it, we figured it would be better to go to the files, rather than force people to bring the files to us.

We only access the files you choose, also Marvel was approved by the DB API team to use the service (a bit like the App Store)

Well, it's pretty frightening that you're asking for such massive, wide-scale permissions.

I understand that people are permission-clicky-happy nowadays, so it's probably something that won't even remotely affect your growth - it's just a shock to see new, tech-friendly services going with permission-grabs (even if it is, as you say, to allow for better UX)

I can't imagine why anyone would want to give up such massive access, and potentially commercially sensitive info (that they possibly don't own), but I definitely wish you all the best with this

edit typo

Sadly we had to request access to your image files otherwise we wouldn't be able to allow you to use them in your prototype and keep them in sync.

It's a delicate subject I totally understand, thanks for the best wishes!

How hard would it be to offer both options? I.e. access restricted to one or several folders, vs. access to the whole Dropbox. Also at least between users you can grant permissions for folders to other Users from within Dropbox. Is there a way to do the same for Apps?

I think this might be possible, i'll look into it!