Opacity masks to hide parts of a shape behind another shape
I hope someone can help me as I'm sure the answer is simple and yet I am spending hours now trying to do this. I am trying to follow the tutorial below, using an opacity mask to hide a part of an object behind another. Despite following the instructions there never seems to be any change when I add the mask. I have the same image on my transparency window before creating the mask, yet nothing changes. Is there something missing from these steps potentially (as I am a beginner and maybe it's assumed) that may help? Any advice would be greatly appreciated.
Cheers Natasha



