Q: How do I add this dynamic selection of users as participants to the business step?

Detail: In the first business process step a user selects from a multi-value List field which users need to approve a document in the second step.

I want the workflow to assign those users as participants of the second step.

Background: I am trying to use the update participants activity but it doesn't seem to allow me to point it to any of the activities that I've tried to retrieve those users from a multi-value token. I thought I could do a For Each Value and within it a Find User then Update Participant but the Update Participant doesn't seem to let me point at Find User.

Also Update Participants shows "There are no participants to update" in the Participants to Update section of the activity.