Homework – do the meet mat challenge download the mesh from substance, and paint it creatively. Feel free to edit it in ZBrush just be careful not to dynamesh since it already has UVs. You can use divisions. Once done export the highest division as your high poly and the lowest as your low poly. You can edit it all you want in ZBrush and even add more meshes just keep in mind you have to make the low poly as well and UVs too. Good luck.