Problem with multiple animations on different layers

Hi everyone,

I am new to iD so I don't know if this is a relatively standard problem to encounter but I can't figure out how to fix it.

I am working on an eBook which comprehends several layers. I added an animation to an object that's part of layer 1, but said animation doesn't work since I added another animation to another object on layer 3.
Layer 3 is shown only if a certain trigger/button is clicked; is there a way to mantain the two animations even if they are on separate layers?

I hope someone can help!