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Niagara System Life Cycle Track

Hi,
I have a simple snow effect in the scene made using niagara. The snow is slowly covering the scene. When rendering this scene, I would like the snow to partially cover the scene from the first frame.

I add the niagara to the sequencer. Then I add a Niagara System Life Cycle Track. In Properties is pre roll frames parameter. But changing this parameter does not give anything.
How to set niagara in seguencer so that scene will be covered with snow from the first frame.

I cannot find anywhere a detailed documentation of Niagara. There is nothing about Niagara System Life Cycle Track.

maybe use burst for particle emitter?