I'm a newbie playing around with some of the stuff I've learnt, so sorry if this is a simple thing. I made a piece that basically is a door scene with a mask applied to the door. I've added a fure effect to the door, that changes to a spooky scene. That works all ok, but I have an issue with the mask. At the moment I'm just using a static background image to keep things simple. The mask is applied, but it's just there as a solid shape, how do I get it to fade in after a few seconds, revealing the flames?
Can you post a screenshot so we can see visually what you are trying to do? FTI, there are opacity settings for masks that you can animate to reveal things, or you can precomp a mask and its masked layer.
Noy sure if this is a messy way of doing it, but I did work out a solution in the end. Basically I made a layer that contained a copy of the master image, setting it's duration to 3s, applied a mask to it that fades out, revealing the layer below. It works but pretty certain it's a "hack job" 🙂