Image component with video doesn't want to use render opacity keyframe's

hi everyone,

I have a weird problem.
I try to let a video fade out in a widget, but for some reason it doesn’t want to work. (it’s making a hard cut now)

I tried to do it with an render opacity animation track. (first with the whole canvas slot and then with the specific image component, but both doesn’t work)

Do I do something wrong?
or is it just not possible?

problem solved! ;D

the problem was that my material (where my video texture is stored) wasn’t translucent.

now it works! ;D