SubUV modules allow particles to utilize textures, in which a grid of individual “frames” is laid out. We use the power of this module to create realistic-looking pyro effects inside UE with just a few clicks! We begin by setting up our scene, and then we set up our Niagara system to bring our textures to life! This tutorial is very simple to follow and I hope you find it useful.
https://dev.epicgames.com/community/learning/tutorials/q3ZK/creating-fire-with-unreal-engine