B2.73 - No ability to have shadowed smoke.

I know this is like easy stuff but every resource i’ve yet looked at says the same thing, and its the same thing that just isnt making a difference. Heres what i did:

New scene, do “quick smoke” on the box and save the file so you can bake smoke.
Bake smoke
Put a plane in the background.
Set light so the smoke should cast a shadow on the smoke area
Domain box renders a shadow, not the smoke.
Turn on “recieve transparency” in the smoke inflow objects settings (theres no option for this on the domain).
No shadow renders at all.

I feel like something obvious is missing here. Does anyone know what the problem is?