Prototype "Back" is not working in my prototype somehow

Hi Guys, i was create the “back” interaction. I set up as “tap” + “back” on an arrow. However, when i present, it doesnt go back to the previous screen. It seems like there is no interaction exist at the arrow.

May i know if the above set up is correct? Do i need to do extra links or set up in order for the arrow to work as “back” ?

Thank you!