Dropbox is not showing up as a service to pick from even though I added it to the services list. How do I make it show up?

In order to comply with Dropbox's terms of service, we require that all Filestack customers that want to use Dropbox in the picker create and provide us with their own Dropbox API keys. Here is a guide on how to set this up: How to create a Dropbox Application. It takes about 5-10 minutes to set up and then you shouldn't have to worry about it ever again.