Can't animate scale within character mesh

[anonymous_user_e5be9983]

I have a character than shoots light beams using a Maya animation. These beams are just textures on a plane. I need the plane (light) to toggle on and off during the animation. I’ve tried two things…

1. Scaling the bone. Works in Maya but I don’t think Unreal reads Bone scale data.
2. Scaling the mesh itself from 0.01 to 1. but this animation doesn’t seem to export in the FBX.

Any idea on how I can achieve this?

Thanks in advance.