In the context of using the software, "paper" often refers to specific artistic styles or workflows:

: A textbook-style guide by Against The Clock, Inc.. 🎨 Creative "Paper" Techniques

Locate for creating a "paper cutout" style in Animate.

: Enhanced pressure and tilt sensitivity for a more natural feel on tablets.

: Introduced virtual camera support to pan, zoom, and rotate.

If you are looking for physical paper resources for this version, several comprehensive guides were published: