here 3 picture if you want more tell me !
I put the BP in the trigger box, its goes there right? or in the ball event graph?, and yea i put a trigger box and a ball on it and nothing happens before and after i grab it
yea i was starting with the ball on it, and i cant us the level blueprint its a team project and my teammates dont really want me to touch that
Since your setup is correct, it seems the problem lies with the overlap. Are you sure that the ball itself is overlapping the trigger?
Are you starting with the ball on it the trigger? You should probably start with it outside of it.
Also, you could use the level blueprint for this. Click the trigger volume in the level, right click in the level BP, and type in “overlap”. Select the begin overlap option and do the exact same setup
but i tested with walking on one and it does nothing 
its 1:30 am here where i live i need to go… ill come back tommorow to see if you answered! thanks :), i tryed some thing and nothing happened too… kinda weird ;s
if you still see this post i still struggle ;s