Let's begin by making sure we have the Render Targets we require.
Here you should see the default Render Targets that come with the asset.
These should be:
RT_Fluid_Complete
RT_Fluid_Complete_N
RT_Fluid_Complete_Alt
RT_Fluid_Complete_N_Alt
These render targets make up the small unit fluid simulation and the larger object fluid simulation layers. If you would like to have more unique fluid sim layers, duplicate or create another set of render targets. for e.g.
