Why is there a black square with my flipbook?

[Night_Of_Tubbs]

Game - 2D platformer
First time using UE4

So I have been tasked to create a basic platformer game as a project for my university work. When I created my animations using the photoshop and after effects, I noticed that I had a black square that was in the background of my frames, so when I created the flipbook and added the animation to the game there was a black square that surrounded the animation.

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What I did

1. imported the .tga files into UE4

2. Then I applied the paper 2d texture settings and created a sprite of each frame.

3. Then I took the sprites and then created a flipbook with them.

4. I then applied the new flipbook for my main character.

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This is how it looks within after effects

[Night_Of_Tubbs]

I managed to fix this by exporting the sort animation as a PNG Sequence on After Effects.