Replicate Up/Down Rotation of camera

I have multiplayer setup and i want to spawn grenades at an offset from the character. I made an arrow, attached it to the camera, but it does not rotate with the camera. from the clients view it does. i tried to replicate that without success. i can enable “use controller pitch”, but that also rotates the whole pawn. i could also get the aim rotation of the pawn and try to rotate the arrow around the camera, if that works.
has anybody done this and can get an advice?

Update: i did not manage to attach something to the camera, that follows it when rotating up and down. i just do it manually now with a little vector math. the up/down rotation can be obtained with getworldrotation on the camera.