imageOverlays

A collection of overlays for displaying images in the scene view. An image overlay collection cannot belong to more that one SceneView.

If the collection contains multiple image overlays, they display in the order in which they were added to the collection.

So the first overlay in the collection (at index 0) displays at the bottom and each one that follows displays on top of the previous ones.

If the SceneView also has a GraphicsOverlay, it displays on top of the ImageOverlay.