Particles turning to squares whenver i input the material I made

Im trying to make this little explosion, this is my second day in unreal engine and its going decently, i just do not want these squares.

Hey there @anonymous_user_d17a67f1! Welcome to the community! Does your texture have MipMaps enabled? It could be downsampling it based on that. You could disable them on the texture itself and give it another shot and let me know how it goes!