AI Ragdoll replication

Hello everyone. I’m trying to replicate ragdoll physics for my AI Bot. Ragdoll enables only when the Bot’s skeletal mesh is hit by a projectile. The point is, that it works only on the server (when choosing Listen Server as a Net Mode). Also found out that my AI Bot’s AIController is NULL(chaning default aicontroller to a new one didn’t work). I know AIController is handled on the server’s side, but I have no idea what this means. What is actually a server’s side? a Blueprint or what? And most importantly, how do I make stuff on the server? Thanks in advance