How can I make an ocean to fill go with my custom landscape?

Thanks. Coming from Lumberyard I am used to simply placing an infinite ocean which fills in all low points of the terrain mesh, and then you simply adjust the Z placement to determine how deep or shallow you want it to be on the Terrain. I was hoping there would be something similar in Unreal but I can’t seem to get water to work at all with my heightmap. Maybe I’m just doing it wrong using the Ocean plugin.