Using Scenes in Tilemaps (Godot 4)

There's a feature in Godot 4+ that allows you to place scenes in your Tilemap just as you would sprites. It's not exactly hidden but it's also not plainly obvious, especially if you're going in the this-is-where-I-paint-tiles kind of mindset that many are when in Tilemap mode.

This video covers how and why you might use such a feature.