Can I use weight paint in the middle of a face? I've been following along with this tutorial (you don't need to watch it). I made a plate mesh, and it's quite low-poly. The top of it is only one (1) n-gon. I was hoping to use weight paint in the middle of that n-gon, but it seems I'm only allowed to weight paint around its vertices. As the title asks, is there a way to weight paint in the middle of that face, or do I have to use triangulate or some other modifier to add vertices?

Thank you!

EDIT: Thanks, those were exactly the kind of answers I was looking for!
Welcome to Blender Stack Exchange! Weight painting specifically weights vertices, so no, there is no way to weight the middle of a face. A vertex is the most basic piece of a mesh, so in order to define how a mesh should look or behave, it needs to have vertices wherever you want there to be detail/information.