Mod won't work

My custom decals for cars won’t activate in multiplayer anyone know how to fix it?

Mods will not work in multiplayer unless they are installed on the server. You either need to be the server owner or contact the server owner and have them add the mod on the backend. Locally installed mods will not show up in BeamMP.

After downloading BeamMp All my mods are still in the folder but not in my game, Including freeroam