This is the interactive function of backpack, equipment, and store blueprints. I am an Unreal Engine developer and also an Unreal Engine tutorial teacher. Due to the fast update speed of Unreal Engine, this function in the store has existed for four years. Well, many settings in the engine have changed a lot, causing many novices to have difficulties in selecting interactive functions. Therefore, I redeveloped this function with version 5.4, suitable for the latest version 5.42, to facilitate everyone