Timeline issue : Blank in the end

I am creating the e-Learning module, in which there are almost 120 slides, but the issue is I have to test the individual slide as it goes blank at the end of every slide all the buttons, logos disappeared. To make sure we are sending the correct modules we have to test each slide now, please let me know if any solution is there for same.

 

We are already trying the dragging option in the timeline.

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