Problem seeing render in compositor and transparency

When I go to compositor by image does not come in background. I tun on backdrop and I render but it is blank. If I switch from RGBA to RGB it goes black. I’m not sure whats wrong.

Also problem when I render, the transparency disappears. I have freestlye on but it still not transparent when i turn off. In middle of render there is transparent but when finished it goes black I dont know why. I have transparency in film turned on and output set to RGBA

other pictures

Here is blendWheel.blend (715 KB)

The backdrop only shows what a Viewer node is connected to.
And the render turns black, because you have “Use Alpha” disabled in the Composite node:

Ooohh thank you. Sorry for stupid question. If you have reddit I can give you gold or some other thank you.