Stuck on Process Folders and Data

[font=Roboto, Arial, Helvetica, sans-serif]What Im trying to accomplish is a flow that sets up a process folder and as the user works through the process, the data in the process folder is updated. I have the save process data and setup process folder steps in the flow, and have a FlowExecutionExtension setup. It all seems to work, but, after the process folder is created I cant figure out how to update the fields in it. For example: say the process folder has an extension data field called Payment 1. During the flow, after Ive setup the process folder, the payment is calculated. I can save the process data, but it does not save in the extension data for that process folder. The reason Im asking about this is I want to create an action on that process folder that would run a flow and re-send an email with the information from the flow. Maybe Im just doing this backwards?[/font]