If I got what you say in the question…button_up and Down is a texture…when you click you want they to change de texture and when you release the mouse button the backk to normal…
1)You need to create a hud blueprint
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Create a button :With Texture (using a select node). The select will give you two options based on a bool or int or byte variable data; and a hitbox
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Create a event when you click a hitbox…the bool (or int or byte) will change the value…so the select will draw another texture (The Button_down)
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Another hitbox event called “release” and if the value of the bool was true…create your actions…
Sorry for my bad english 