It's not automatic. You have to click "Publish" before it's uploaded to Steam.
Edit: Nevermind. You only need to click "Publish" if it's a non-Steam game. (Or you disable automatic uploading.)
Additionally, does anyone know if this stores images locally too? I'd like to take and save...
The geometry and texture resolutions really show off the engine's age.
Although I have an eye for graphics, I don't let it come in between me and the gameplay. Because that's all the matters.