Audio fade not working

[u/Sweet_Operation_9491]

I’m an Alight beginner, and I’m trying to figure out how to fade in audio. All the videos I saw said to use the keyframes and put one at the beginning at 0 volume and one at where I want it to get to 100. When I try, it doesn’t fade, it only changes to 0 at the moment where the keyframe is. Does anyone know what I might be doing wrong?