the square mesh is missing.
Fusion lacks CV cage edit for sculpting with NURBS surface - but for that the edit face (Brep to TS) combo couldwork (only if we can have survatures combs in this mode as well btw)
so it would be great if I could just place a mesh and then start sculpting that Brep patch
Otherwise I have to split the base feature in to base feature + TS feature ...

