I created a drawing from a part, and I can't get the centerline to show up. I attached two images. One is the drawing I'm trying to replicate, with centerlines shown for the curved part. The other is a screenshot of my problem. I selected "add centerline" and clicked inside the concave faces, but the centerlines won't appear. You can see blue pluses where I clicked. I've done this with several other drawings and the centerlines show up fine, it's just this one.
-made sure annotations are shown
-checked the layer; there's only one (the default)
-restarted the computer and Solidworks
-combed through every setting (though they haven't changed since the last successful attempt)
-searched these forums and the internet for a solution and I can't see where anybody else has had this problem
*edit* uploaded part and drawing files
*edit again* went back into part file and fully defined all sketches, still can't add centerline, uploaded latest part and drawing files