How do you play a scenario?

[An Ning]

I'm exploring the scenario editor.

I have the park set, the borders set, the goals set, the research set, the spawn set, and I saved the park (repeatedly).

I don't see a way to move it from the editor to a playable file, though.
I can find and open it if I open the editor, but if I open sandbox, the file isn't there to load.

How do I make a scenario playable?

[Draco18s]

I've imported stuff from the workshop too and best I've been able to do is start a multiplayer game, select the scenario I want to play, and then password protect it so no one can join.

[tr!star*]

You should find it under Sandbox - New Park.

[An Ning]

I was trying to load it in sandbox.

Thanks.