imported stl graphic

I imported a stl file as a graphic for visual reference but I can not seem to be able to move it around or change orientation.

It is listed in the tree as "stl graphics1".

Even if I right click on it there is no move option and the feature "move/copy" can not be applied either.

I can not import it as a surface of solid because of the complexity of the model.

Thank you for your help

SolidworksImport export