I have created an ellipse and divided it into arcs/segments. I've placed a line intersecting one of these arcs with the intent to round the corner. When I select the Fillet tool, I can select the first object (line), but when I try to select the second object (ellipse segment) the preview fillet is only a circle at the center of the ellipse. When I click the ellipse segment, it places a circle at the center of the ellipse. I'm unable to create a fillet between the ellipse segment and the line. Am I doing something wrong?