UI Question

Hey trying to make a main menu and i’m just ripping off fortnite and apex legends.

I was trying to increment the integer by +1/-1 of the widget index by the click of a button, it works but only works with 2 numbers and does not register the 3rd. (this is for a sidescrolling news windows)

I also wanted to know if there was a method to get easier sidescrolling.

Also wondering how to get animations on hover (switch between images?) can’t do flipbook so how can I get an animated button that stays animated so long as it’s activated/pressed?