In version 3.6 of WP Edit Pro; the Dropbox button was introduced. In order to use the Dropbox button; a web application must first be created.
This post is intended to walk through the process of creating said Dropbox web application.
Create Drobox Web Application
The first step is to visit the Developers Applications section of Dropbox. A new account will need to be created if one doesn’t already exist.
Create Application and Select Name
Finally, click “Create App”.
Obtaining Application Key
Lastly, enter the domain of the website where the dropbox files will appear (your site url) into the “Drop-ins domains” option field. This is necessary to connect successfully to the Dropbox API and pull the files to the website.
Congratulations! Dropbox is now successfully configured.