How to adjust opacity of animtrail particle??

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I’m making some weapon attack effect with unreal engine 4.15.
I tried do someting with animtrail particle, and gave it to animaiton trail.
so, i want to make the particle to be disappear like it is fading out, so i tried adjusting alpha color from particle cascade,
but it seems not working in animation paricle…

i want to make black circled area to be faded out !

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Not sure if you already tried, but can you make the particles life time longer and fade to 0 before Alpha Over Life In Value 1? Same for fading in.