custom back button in question bank

Hi heroes,

                    I have created a project in which i have to create a question bank. Question bank contain 3 knowledge check. I have used custom next previous option in this project. When the learner goes to question bank and attempt first knowledge check and goes to second one. In second knowledge check i can't control the back button for previous question. Trigger does not showing the slide name of knowledge check that are in question bank. Can anyone tell me how to jump back for first question slide from second question slide.

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