They are probably TEXMAPs from Lego.
Stud.io doesn't want to play nice in the sandbox and share their custom extensions with the community. There are forum on Bricklink to complain but it probably won't get you anywhere.
Stud.io doesn't want to play nice in the sandbox and share their custom extensions with the community. There are forum on Bricklink to complain but it probably won't get you anywhere.