Sculpt mode: Pose brush chain

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Reference: https://i.imgur.com/qKaPfqN.png

There is mention and use of a Pose Brush Chain, but I cannot get it to go past one stick (no chain), much less focus on IK. Does anyone know how to enable the Pose Brush Chain?

Edit, 2 hours later: Never mind, found it! https://i.imgur.com/js4HgaP.png https://i.imgur.com/XhiD2Ob.png