Suggest save as file.mrf. Note you can drag the slider bar on top to view different percentage combos. The Movie duration is equal to the sum total of the sequence durations. Select quality and Frames per second as you wish. Can only use to help visualize the keypoints and how the resultant morph movie will look.
Line is drawn.
Provide enough keypoints. Use Magnify tool to help correctly place keypoints. Otherwise open it up. For Windows hold down Cntrl Key and and click on desired keypoint. For Mac instead hold down the Option Key and click on desired keypoint.