What is the Dropbox API update?
This version of the SignNow iOS app uses Dropbox API v2. Previous version of the SignNow iOS app uses Dropbox API v1, which will be turned off on 6/28/17. After this date, Dropbox integration in previous versions of the SignNow iOS app will no longer work. Users who want to download and upload Dropbox files from within the SignNow iOS app will need to update to this version.
Learn more here: https://blogs.dropbox.com/developers/2016/06/api-v1-deprecated/