Changing Items to Hero Abilities - No Icon on UI

[Atomus]

I found the option to change items to hero abilities and adding button positions for learning them. When I launch the game, click to learn the ability for the selected hero, there is no icon for me to use the hero ability on my user interface; just a black square where it should be. How do I get the ability to display a clickable icon on the UI?

 

[Atomus]

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