How to make a fading trail

I make a trail that would follow my character and fade out. Then the next day, I lost all my code. So I remade the code, but it doesn’t seem to be working.

My code:

My game: Flowlab Game Creator - New Game

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Just use an Ease block connected to the Alpha, and when it’s done, connect the “done” output to the Destroyer

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what bradenS said was right (and you should use it) but just to tell you, you put the wrong output on the filter into destroy

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Also, code should usually always save. The only reason it would not work would be a poor internet connection or you closed the tab while still in the behavior editor.