Thank you for the answer.
Oh, I didn’t know root motion is used for the funtion. I’m planning on making single game, of course, i guess I need to use root motion.
And My situation is … If I check on the “use root motion” in Animation BP, the character swims in the air (in the BP editor and the viewport). I guess the animation has no root motion. So I think I should add root bone manually… is it right?