Hi Pxalot! At the moment, the wave warp feature only works on a single frame image and generates the animation from that. It doesn’t yet support applying the effect across multiple existing frames in a layer, so it won’t follow something like a walking cycle.
As a workaround, you could try creating an aura that covers both legs (or the whole character), then apply the wave effect to that.
This is a really good idea though, I might consider adding support for this in a future update.
Also, my Reflecto plugin can create a wave/ripple effect on a selected layer and apply it across all frames. You might want to experiment with that, although it has limited control over the wave direction since it’s mainly designed for reflection effects.