What is meaning of "level instance is not using external actors"

Development World Creation
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Hello, I am migrating a traditional level to world-partition level. I converted the original level using the editor tool. Then I create LevelInstance Actor Blueprints and set their “Level” property as original sublevels; then I added the LevelInstance to the converted level. Everything seems work well. However, I got error messages “level instance is not using external actors”.

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I don’t understand the meaning of these errors, nor know how to fix them. Could anyone help me about this please? Thanks in advance.

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You can right clicked on the instanced level(s) in the content browser and choose called “add partitioned streaming support…” to fix the error.

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What is it doing? I can’t see the level instance actor anymore when I go into PIE

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Try to load it in the world partition panel.

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Here’s the answer on Reddit.

In short enable OFPA for the normal map that you were using as an instance.

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谢谢，我才发现是在Content里右键关卡才能找到这个选项。我一直在场景大纲里找，难怪找不到。