Update doesn't work after change in animation

[Dene33]

I have some animated character with rig, I create onion skinning for its mesh and draw the result. Everything works fine but if I change some bone rotation (and click Update button) - onion skinning is not updated.

[iBrushC]

This is because you need to keyframe it. Right now, there is no (efficient) way to get the exact state that a rigged object is in without having a keyframe, so you need to place one before updating.

[Dene33]

Actually I've keyframed it and it doesn't update.