I am new to Ae, so this may be a simple question/solution.
I applied an Alpha Matte layer to an image in the layer above it. Once I apply it, the eyeball shutsoff and it appears that it has worked but is not visible in my composition. From tutorials I've watch it seems that I should be seeing the masked image. Am I missing something here? The image I am trying to effect is a layered TIF file and the layer I am using to mask is a PDF. Would that matter?