You only can see it in the final render..... That answer your question? Render it see if it shows up, Broadcast quality is fine. If you can't see it then there is some other problem we'll try that one next. let us know. Don't feel stupid Alpha channel type pictures and alpha planes are a very complicated concept to grasp for people. It's how we make trees look proper and lots of very special effects. It's a very powerfull feature. It's our way of telling the computer what is clear and what is not clear. It takes a bit to get used to. Oh just looked. Rotate your alpha plane in the scene so it's 90 degrees to the camera. Try a different atmosphere like a cloudy one. Direct sunlight could be goofing you up.