Tbh I didnt really notice the black indents where the arrows appear. I did try clicking on the dots at the bottom of the display though.To the right side of the phone if you hover over the black area, you should see an arrow appear to move forward. I'll change this for the next update as others are having difficulties with it too.
That would be my suggestion then, i) let the dots act as a way to select the page, ii) have the page navigation arrows always visible if there is another page to view.
(To be clear, love the story so far.)