Help with spot light texture

Hello! I want to add a texture to the flashlight of my game. I know how to do it, but all the tutorials I’ve seen only teach you how to add a black and white image, and I want a different look, like this:

I’ve tried to recreate it in Photoshop, but when trying it in engine, this is what it looks like:

No colour, just white. Could someone help me out with this? Thank you!

Maybe something here will help