Sprite on top of everything

Hey there!

i made a pingpong-scaling sprite which shall indicate a position where a touch-interaction is possible.
I need to display/render the Sprite over every 3D-object. So if there is a Wall in front of the Sprite, it should be rendered anyway on top/in front of the wall.
Anyone got an idea how to achieve this?

Greetings

 

Ok, I copied the default-sprite shader and put in " ZTest Always" and it works in the play mode of the editor.
When I build it for Android it still doesnt work...