Using Variables to disable Next Button

If I'm using a slide that has 4 layers and I want to disable the next button until each layer has been played. I was able to disable the next button but if the user clicks on all the layers, the next button appears and I need to make sure the button stays disable until the 4th layer which has a video is played entirely before the user can select the next button and move on.

 Do I need to variables here with separate conditions? 

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