Particle SubUV Help

Hey everyone, I created and explosion thats 48 frames in After effects, I used “Contact Sheet II” in Photoshop to compile all the images into one texture sheet a 2048 x 2048 targa. Im having issues getting that TGA setup in UE4 to be made into a SubUV Movie clip for use with an emitter. Any tutorials, walkthroughs or suggestions out there?

And watch this if you want to learn more about Cascade.

He uses UDK but majority of the settings still apply to UE4.