In the context of 3D digital sculpting, "solid paper" typically refers to:

: Video guides that often explain how to use the contents of his .zip files, including stylized character workflows. Are you trying to open a specific file from this zip, or

: A specific project file included in one of his beginner-friendly courses, such as his Sculpting In Blender For Beginners series. Resources from YanSculpts

: Alpha textures or brush sets that allow artists to sculpt "paper-like" surfaces or create stylized wrinkles and tears.

The reference to "YanSculpting.zip — solid paper" likely points to a downloadable asset or project file from (YanJun Cheng), a well-known character artist and Blender educator . He frequently shares .zip files containing brushes, scene files, and materials through his Gumroad and Patreon .