How do I set the portrait in a Scenario Editor dialog trigger?

I’m currently working on making a set of missions in the scenario editor, and I’ve hit a roadblock in attempting to set the portrait in the Play Dialog trigger. I’m not going to be inputting my own audio, I just want to write my message in the ‘subtitle’ box and have messages spoken throughout by different units. What do I put in the ‘Portrait’ box? I’ve not been able to make it work in hours of trying.


Did you solve? I think dialogue triggers are bugged