There's no way to load just an image to MM.
Instead you can import a textured plane mesh surface to the scene (e.g the attached bundle of obj + mtl + image)
To replace the image of that bundle by an image of your choice, you simply need to replace the ImagePlane.png with a square sized image (1024x1024 pixels) in .png format before importing the obj in MM.
As an option for static overlay images you may use a third party application allowing to set a window as a non reactive overlay (something like Overlay2)
Gunter Weber
Triangle Artisan
