Trouble rendering an animated matte animation

Hey there, sorry it’s me again.

I found out how to use the animated matte generator but I can’t find how to render it properly. Any piece of advice would be appreciated!

I used to be able to render the colour art (but wasn’t anti-aliased ?!) but now I only have the background when rendering.

At no times I’ve been able to render the line art.

I’d like to use for the same purpose mentioned here in the official documentation :

I also watched (a few times already) this tutorial but this isn’t helping very much :
Here’s a screenshot of my main window :