I am trying to extrude a gpx file which I created at alltrails.com. I am following the tutorial below but its not extruding. You'll see that when the file is rendered it doing something and not extruding all the points. What you're seeing in the rendered file is the start stop point from when I created the gpx in alltrails. I've tried deleting vertices but to no avail. I am a noob to blender.