Buoyancy

Engine: 4.27.2
Problem: Buoyancy

I have been trying to get Buoyancy to work in 4.27.2 - using the Water plugin - the problem is all the tutorials on YouTube using buoyancy are for UE4.26. I cannot find the example blueprint using buoyancy on my computer, so, I had to create my own. The result: the cube that is supposed to be buoyant sink to the bottom of the lake.

This is what I have done in the BluePrint:

Any help would be greatly appreciated.