Firstly, I assume that you create an access token to connect to my dropbox folder. But if it is like when I sync with Google or Outlook (using my own DLL applications I have written) you should be able to write your access token to a data file. It should also put there a refresh access token which last for much longer. Atleast it does for the two platforms I mentioned. This means that you are not constantly asked for the user name and password.
Also, offer ability to replace the existing database in the folder. Else it just piggy backs them all and I don't always want to do that.
Thanks for considering.