@Grot13 By the means of locomotion system, do you mean the skeletal system? If so, how did you change it such that it works in a water volume? Do you have to change something outside of Unreal? I haven’t really had much experience on locomotion system before.
Btw, I’ve changed the settings of the character blueprint, such that the Default Movement Mode When In Water is Flying instead of Swimming. And for Nav Movement, I’ve disabled IsSwimming, and enabled IsFlying. However, it still doesn’t move in the Physics Volume.