I got it to work, but noticed a few things...
For our design, we don't need a caption. Obviously, leaving it blank will not show any letters. However, it still leaves a grey box at the upper right of the screen.
The icon on the left appears to point to the left, implying "Step Back". But the icon on the right points to the left as well. So we'd want to change the icons.
The sizing / timing... how can we change?