Can't Put 2D layer into element 3d Model "the right way"!

Start by going through the tutorials on Video Copilot. 

Basically, key your footage layer, pre-compose, turn off the pre-comp in the main comp. Open up the textures in Element 3D and pick the pre-comp as a texture and then add the texture to a plane. There's not much to it other than that.

Nothing wrong here. E3D does not interact with regular AE 3D layers nor 2D ones. If you really want to place yourself directly in the wheel house the simplest way of doing that would be to use your keyed layer as a texture in E3D. Create a pre-comp, reference it as a custom texture in the effect controls, then create a plane inside the E3D editor to which you assign your texture.

Mylenium

Cropped screenshots that don't tell us anything about the settings are pretty useless for diagnosing problems. If you want to use a layer as a texture you have to add a surface to the 3D scene. Have you gone through the Element 3D tutorials over at Video Copilot? 

One more thing,  The "Drag & Drop here..." area is buggy and should not be used to share images. Please use the toolbar or just drag your images to the reply field.