Keep ARKit FeaturePoints' particles

In the PointCloudParticleExample, I am trying to get the feature points to last longer than just the current frame.

It seems like changing the ParticleSystem values isn't doing anything to the result. Is that because the lifetime parameter is not connected into the example script? If so what is the line of code that I would need to add to get the particles to persist fora set amount of time?

Or is it because the particles are only updated per frame? Are they deleted thereafter or is it just that their lifetime is short?

Thank you in advance!