Making particle Trail
each particle from different emitter(point) should have attributes.
Particles are better to emit every frame with $NPT
make group by partition and the attribute
add add
add Resample if you need.
Fake Motion Bulr
needs to cache out the particle simulation at first.
add trail
add add
If you want to edit length, use resample
add UVTexture
add Delete to delete back point
If you have Camera move, add inverted Camera Transform before and camera transform after this.