How to resume video where the learner left off

Thanks Sally, that was actually a brilliant suggestion. However, the other issue we are experiencing now is that whenever the window is closed in our LMS (we use Cornerstone) rather than clicking on the Exit button trigger, Cornerstone updates the training as Completed, even though they have not finished watching the video which is on slide one.  I have created several projects with various triggers and slides and layers and all those triggers are null and void if someone clicks on the close window. Does anyone have suggestions?