The proper article for the Pivot Animator Stick Library is:
What is the Pivot Animator Stick Library? pivot animator stick library
specifically, it is a separate, professional 2D drawing software often mentioned alongside Pivot for hand-drawn animation. It is not a feature within Pivot itself, but you can draw "paper" frames there and import them into Pivot as backgrounds or sprites. Quick File Reference Topic: 1.3.7. STK Files - Pivot Animator The proper article for the Pivot Animator Stick