Upload images behind the "shadow" layer

Hi guys,

thanks for the amazing plugin.

As it says on the demo video, i've created a new product with 4 layers. (base, shadow and 2 more)

I would like people to be able to upload their own images and place it on my new product.

I've did it all except to set their upload layers to be under the shadow layer, so it will look more realistic & fine

at the moment, it's just add their image on all layers and it doesn't look good.

any help ?:)

Thanks!

T