Aim: lock the nigara fx to cetrain frame range in the scene for same render result everytime
Drag nigara system asset in scene to wanted position (in this case, want a spark impact moment of the fx)
Drag the nigara from outliner to sequencer timeline
Click on +Track → Niagara Component0
Select the Track just added, click Niagara system Life cycle track
A red life cycle track is created in timeline (use to offset timing of the niagara paricle system forward/backward)
R click on the life cycle track → Properties → Age Updated Mode → choose Desired Age
Drag the life cycle track to match the frame moment where want the fx starts (here is 74th frame, play around to see if the fx syn better if drag 1 frame earlier than the wanted moment)