Most things work has commented but thers a issues with LOD4 on static meshes I believe, is only issue I've found..
Serializing behind stopper (343DA+CFCC0 > 34479)
FPakFile::Serialize:file=/Game/Art/Character/Hero/Agathon/Agathon_Weapon/Agathon_Weapon_03.uexp <- TArray::SerializeSimple <- FStaticMeshLODModel4::SerializeBuffers <- FStaticMeshLODModel4<< <- TArray::Serialize:0/1 <- UStaticMesh4::Serialize <- LoadObject:StaticMesh4'Agathon_Weapon_03.Agathon_Weapon_03', pos=34C39, ver=518/0 (unversioned), game=ue4.24 <- UObject::EndLoad <- LoadWholePackage:Agathon_Weapon_03 <- CUmodelApp::ShowPackageUI <- CUmodelApp::ProcessKey:key=6F, down=1 <- VisualizerLoop <- Main:umodel_build=1188