I'm playing around with the filament solver, and I can't seem to get it to work the way they say it does. I am looking to apply a velocity attribute (v) to the points going into the simulation and have them adjust the way it evolves, which the documentation clearly states it can do at the bottom. Is this just broken? What ends up happening is that it pops in the direction of the v attribute on frame 2, but then just progresses as it does without the v attribute at all. Did I just miss a setting somewhere?

I think the issue is that the Filament Advect SOP isn't preserving attributes, so your velocity attribute is lost after frame 1.

The docs were probably hinting at using the pre/post-solve inputs on the Filament Solver to apply forces / velocity to the filament geometry.