WPD w3all WordPress plugin for Dropbox is available:
The Dropbox plugin installed here at axew3.com, and activated for an user named axew3, which page example you can see here:
Site example: https://plugins.w3tasks.com/wp/
If you like to test out the user interface, where you can manage Dropbox files to display in WordPress, within your page, please register on the above site, and contact me. The plugin will be available also at envato.com.
Take a look also here to get an immediate idea: