What?
Formstack Documents has updated the Dropbox integration to automatically refresh the access token when they expire.
Why?
Some time ago Dropbox switched to only issuing short-lived access tokens (and optional refresh tokens) instead of long-lived access tokens.
More info here: https://developers.dropbox.com/oauth-guide
Will customers need to reauthenticate?
All existing integrations are going to keep working, however, existing access tokens cannot be automatically refreshed. That means customers must log in once their current access token expires and re-authenticate. After that, the token will be automatically refreshed every time it expires.