I have looked through some posts but can't find my answer. I have created a falling Polaroid composition following Evan Abrams tutorial.
All is working as I want it to except, as the photos fall on top of each other the bottom photo shows through, which I don't want it to.
I am fairly new to after effects and have checked everything I can think of. See the attached photo for reference. Any help would be appreciated.
this is not an alpha error. You have to make sure that you set apart your layers in Z space. It looks like what you are doing is with 3D layers. Even offsetting the Z position by 0.5 or 1 will tell after effects which layer is actually in front of the other without changing your overall animation or look too much.