I exported liquid sim to ue4 well, before but after uploaded Game dev tool set to newest version I couldn't get good result anymore.
I tried it previous then I could do better (still not perfect) so I think I have some problem on mesh but I don't know. well I need someone help please
PLEASE

Try exporting from particlefluidsurface1, see if that works and then look for which node is causing the problem.

Also: make sure your UE material has tangent space normals unticked