Hey @matt.ostanik 
You can add conditions to the workflow in the ‘only when’ input. For example, you could have two workflows pertaining to a Save Button, depending on whether the Current User is logged in or not:
In this workflow, the Current User is logged in, and the Make Changes to Current User action will occur.
In this workflow, the Current User isn’t logged in, and a Login Popup will be shown to prompt the User to login.