Spawning particles with Region mask

Hello, I am trying to have particles spawn on top of my mesh but only in places where the sphere mask is. And the sphere mask is supposed to expand over time.

In the first video, you can see how the mask is working and doing its thing but how do I get the particles to spawn where the mask is?

The second video is the visual effect I’m looking for, BUT… the size of the mask only changes when I manually drag the scale of the curve by hand. I also had to place some of the Update modules into the Spawn section, which obviously isn’t right but its just to get the point across on what the final result should look like.