Here's what I've done:
1. Created a simple SOP HDA
2. Added a sphere
3. Scattered points on the sphere
4. Added a unreal_instance point attrib and set it to a reference path from UE.
However when I instance this HDA into a level in UE nothing happens. Just get the Houdini logo mesh. However If I do copy to points in the HDA that works and I can replace the geo with a UE reference.
Is there a special trick to getting vanilla point instancing working in UE?