Ok my bad, I was trying to merge two of the default plane objects, not meshes. When I imported a quad as fbx, duplicated it a few times and ran the same thing, it works. I guess merge actors only works on mesh assets.
Ok my bad, I was trying to merge two of the default plane objects, not meshes. When I imported a quad as fbx, duplicated it a few times and ran the same thing, it works. I guess merge actors only works on mesh assets.