actor is set to be replicated
Hi, if its replicated, then you only spawn it on the server (it will automatically replicate to the clients). So from your AttachMP18Server you directly spawn it. AFAIK the AttachActorToComponent then should happen on server and all clients, so e.g. make the “Mp 18StaticMesh” variable RepNotify and then inside the OnRep function attach it.
What you’re doing currently, is: Input Event → ToServer → ToAll → (only client continues here since SwitchHasAuthority Remote) Spawn it locally on each client