I created a simple practice exercise with 3 slides; a home page with 2 buttons (one for module 1 and one for module 2). Each of the 2 slides have a back button. So, when you go to module 1 and click the back button, the module 1 button on the home page displays a 'check mark' to show that module 1 was completed.
I just can't get the module 2 button on the home page to work the same way with the back button on the module 2 slide.
I would appreciate any suggestions. My file is attached.