I recently did an alternative method in this post here using a watermark instead to import the image. It is trial and error, but it’s helped by knowing what the focal length used to take the picture and some knowledge I’ve explained elsewhere about the focal length bug in SU, plus a 3D Connection Spacemouse helped, though I wish there were a fine control setting of some kind. I think I’ve gotten a little more accuracy with Match Photo, but it was my first try with the method.