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Save changes after using AddInstance() not work

I'm adding instances of staticmesh with foliage tool via c++ which works great.
After that, I'm trying to save the changes that made in the editor but nothing happend, it's not saved.
What should I do?

 TActorIterator<AInstancedFoliageActor> foliageIterator(GEditor->GetEditorWorldContext().World());
 AInstancedFoliageActor* foliageActor = *foliageIterator;
 FStringAssetReference materialAsset(TEXT("/Game/myModel"));
 UObject* MyAsset = materialAsset.TryLoad();
 UStaticMesh* staticMesh = (UStaticMesh*)MyAsset;

 UInstancedStaticMeshComponent* meshComponent = NewObject<UInstancedStaticMeshComponent>(foliageActor, UInstancedStaticMeshComponent::StaticClass(), NAME_None, RF_Transactional);

 FTransform transform = FTransform();
Product Version: UE 4.20
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asked Oct 04 '18 at 09:19 AM in C++ Programming

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