JMP workflow - For Each Function

[#1]

I've got a JMP workflow that run steps on a JMP file and I'm trying to get it to run on multiple files at once. From what I've read I need to be using the For Each Function however I'm struggling to use it as it's constantly failing and I can't see much information about it on the website. Does anyone have any tips/guidance on how to apply it to my workflow please.

[#2]

How is it failing? This does offer one example of how to use For Each  Using JMP > Workflow Builder > Additional Examples of the Workflow Builder > Example of a Workflow ... and this is some extra information about For Each in Workflows:

Add for Each

Adds a loop to your workflow. Iterate over tables from a preceding step or group of steps. Also available for JSL lists.