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How to add navigation system on generated level?

Hello there, I’m planning on build a level to auto generate hex tiles and AI character can randomly move on it.
So I create a gamemode BP to spawn board BP at event beginplay, and board BP will generate hex tiles in construction script.

https://forums.unrealengine.com/filedata/fetch?filedataid=161037&type=thumb

First part works fine.

Got some problems with last part, AI character did no move. I try to use NavMeshBoundsVolume as most tutorial did.
It worked if I put board BP in the level manually. I found a project on Epic Launcher did it without NavMeshBoundsVolume, but didn’t figure out how.

https://forums.unrealengine.com/filedata/fetch?filedataid=161038&type=thumb

How can I add navigation after the hex tiles generated?