Learn how to use the Spawn Per Unit module in Unreal Engine 5.3 Niagara! 
In this quick tutorial, we explore how to emit particles strictly based on movement—ideal for character trails, swinging swords, and fast-moving effects. 
https://dev.epicgames.com/community/learning/tutorials/zwlYq/unreal-engine-ue5-3-niagara-fundamentals-spawn-per-unit-14