Using Manycam to show videos with PP or Google Slides

I have a google slides presentation with embedded videos that I wanted to show in Manycam. I was on a google meet, and I put the video source as a desktop display. The students could see it, and I could click from one slide to another (in edit mode), but the display was not a full screen like it is when you present a screen. It was full screen on my computer, but not to the others in the meet. I exported the google slide presentation as a powerpoint, and had that as a layer on manycam. It opened in presentation mode and I couldn’t play the videos. The reason I am trying to do this is because when I present my screen in Google Meet, the sound is awful on the videos. When I have the screen as a layer, it sounds great, but is small. What I am looking for is a way to get the size of a present screen with the clarity of a layer.
Any help would be greatly appreciated.
Thank you,
Jeannine