Blending mode not working?

Hello

I’m working in Harmony 12.1 and I’m simply trying to use the Blending module.

I’m in Render View in my composition window and no matter what I do nothing changes the image.

As you see in the screenshots…I have a window “light” (white) and even with the blending set to multiply ( just to see if it disappears ) it’s not working.

Screen Shot 2015-12-03 at 12.30.51 PM.png

Figured it out. I guess the composite cannot be on seamless bitmap. Glad that’s documented well.