To make a fire like this:

 
 

 

First, creat a few textures as blow:

 

Next, use the textures to make a material as blow in Unreal:

 

Then, using the materials to make Particlesystem as blow in Unreal:

 
 

What I learned:

1. Use SubImageIndex's ConstantCure to make particle's shape and opacity change through its life. (you can start and end at any number out of the 16 sub images)

2. Use Linear_Bland mode (not randoem_blend) so that the SubImage of the alpha rotate in order.

 
 

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