Link parameters doesn't work

I made 2 parts, c cylinder and a plate with a hole, and tried linked the Diameter parameter in the Cylinder file.

First, i chose the Diameter, in the link dialog box, but the new user parameter that was inserted was the file name only.

Secondly, when i activate the Hole parameter in the plate file and select List Parameters in the Equation column, i see only the Hole parameter, not the new one, the Diameter, which i tried to link.

So, the link doesn't work.

But, i have, also, a general question: why do i see, in both files, in the List Parameters dialog, only the parameters which i changed their names? i expected to see all the parameters of the part, no?

Cylinder.ipt

Plate.ipt