Hi Swe08, thanks for the detail. I have something not fully understood. I followed all your steps, after navmesh built, I use PIE or play game standalone to test, and press P to show green navmesh. But when my pawn run away from a sub level, to let it unload, its green area is still shown. Dost that mean the sub level’s navmesh failed unloading? Did I do something wrong?
Update: I forgot check “Force rebuild on load”, everytime when I retry and add a new navmesh Vol in p-level I should recheck that. It works all good now. Thank U