How to use shuriken particle torch

I have been playing with the free particle pack and have successfully implemented a few of them. However Im currently trying the Torch but none of the particles show up.

As you can see the particle is placed (off camera) onto the scene. But neither pressing simulate or clicking “Open Editor” shows anything?

FYI
what I have done with my other particles to get them to play is:

particleSystem.renderer.sortingLayerName = "Foreground";
particleSystem.renderer.sortingOrder = 0;
particleSystem.transform.position = transform.position;

The problem seems to be the Gravity Multiply field. Once I changed that from 0 the particle system shows.