Ue4 i want know how to release the mouse after 【event on mouse leave】can do something

Development Programming & Scripting Blueprint
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1

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like this i drag something ,i want know what can i do after{event on mouse leave} , i can drag item until release mouse， spawnsomething（i know how to spawn）. I JUST WANT TO KNOW HOW TO DETECT MOUSE RELEASE.
please help me ，感激不尽.
jack.chen

2

maybe you can try [event on drag cancelled],i just fool man.