I am trying to use the embedder, but keep receiving the message dropbox refused to connect.
Can you help out? I am working locally and have whitelisted "localhost"
That error generally indicates that you don't have the relevant domain registered for your app in "Chooser / Saver / Embedder domains". You mentioned you registered "localhost", but are you actually running it on localhost? What's the URL of the page where you're trying to display it?
You can also check the JavaScript console, which may contain some helpful error information.
Sorry, I can't help you. I don't know how it works...I was lucky that it worked in our website.