The custom source feature allows a user to add their S3 storage bucket as a source to pick from in the side panel.
Just add 'CUSTOMSOURCE' to the services parameter of your picker options after going through the steps above.
There are some picker option parameters that are specific to the S3 custom source. They allow you to choose the S3 bucket and path to display to customers on the fly.
Specify the name of the S3 bucket to be used for your S3 Custom Source Client. This will override the default bucket set in your developer portal.
Set the folder/path in the S3 bucket to use as the root path in your S3 Custom Source Client. This will override the default path set in your developer portal.