Level streaming and cars / objects?

I’m getting super irritated trying to find out how level streaming should work :confused: It’s exactly like open worlds don’t ever have cars in them when trying to learn how to do it.

I mean the problem I got with it right now is how you add a player interactive object (like a car or box) that is independent from the level it’s in. I mean it’s quite easy to add anything that stay inside that level. Doors, AI ,Buildings all live in that level. But what about objects a player moves outside of the level?

What kind of technique do one use to have a “car” or “box” unload with the level they are in? And how do one load them back when the level is activated agen? It’s like some built in thing in Unreal is soo obvious that no one talks about it? Level streaming / World composition load the chunks (levels) when the player get close enuf to the level. You can set it up quite easily and all. But objects that needs to cross levels can’t be a part to a level that you drive away from. Same if the object isn’t unloaded before the level it’s standing on unloads. There got to be a way.

And I like a huge amount of objects like this all around my game world. Kind of killing me here not being able to.