The Popup Form Data block only works when used inside the Save Success Tasks and/or the Form Close Success Tasksflow parameters of the Show Popup Form block.
Usage Example
The image below shows an example of the Popup Form Data block used inside the Form Close Success Tasks flow parameter of the Show Popup Form block.
The Set Content block is used to set the content of an element on the page to the Name property of the object representing the data entered by the user.