I am trying to connect a collar from my library into a assembly using mate references. I selected a filleted edge as my mate reference and it does not mate the part in the assembly. If I get rid of the fillet it will work. I also tried to add a cylindrical and planer mate and only the cylindrical one will take. So I added an extruded boss so that I can select an edge and then hid it, this works but is there another way to get this mate?