I'm a noob to compositing.
I tried to follow this tutorial on compositing https://www.youtube.com/watch?v=bIZrTXtyQkY&t=1008s&ab_channel=CGBoost.
What I did:
1. Make layers for each collection.
2. I clicked Render Animation as I usually do, and it looked like it was rendering all layers, but when I looked at the file output, it only rendered out only the one layer in which I was looking at.
Playing the tutorial a bit more, apparently I would have to render out all the layers again as such:
But if there is a way to retrieve those other layers which Blender rendered out the first time without rendering all over again, I would take it.