How to make an basic trail

Ok so I’ve been making a football and when they shoot i want to have a white trail in it. But the problem is that i tried many times and looked in a devhub about trail already. But it doesnt works
I made the trail exactly like what the devhub told me to do:
image
But sadly it doesnt work. I tried maxing out a graphics already but nothing seems to appear.

Please help!

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Oh wait nvm i figured it out. I made the transparency to 0 and set it to 0.3 and it worked!
Also i moved the attachment1 a little bit too!