This isn’t something that would happen automatically. You’ll have to mount the *.pak file(s) when you’re ready (providing the path to the pak file). I’m not aware of a good tutorial/example that shows this off, but you’ve given me a good blog topic to write about. Might be able to hunt around Google/here or wait for an example here.
https://docs.unrealengine.com/latest/INT/API/Runtime/Core/Misc/FCoreDelegates/index.html