Setting up videos and lower-thirds in Zoom Events Production Studio

[DCProud]

I am putting together a webinar in Zoom events that will include a number of short videos mixed among the live presenters. I don't see a way to cue videos for playing in Production Studio other than to screen-share them from a desktop. It would be much better to play the videos directly in Production Studio then to play them outside of Zoom via screen-share. Am I missing something?

The other thing that I am hoping to do is to have overlays (for example, a transparent PNG) that I can show over an active speaker. I see the possibility of creating a scene in which a speaker is overlaid onto a background screen, but what I am looking for is the equivalent of a television chyron or lower-third. Is that option somewhere I am not seeing it?

Thanks for your help.