Issue on Context Updating after the Game is Published

Hi, all

I get an issue on updating after the game is published. I don't know how UE4 handle these kinds of issue.

When the game is not published, I add new contents or maps by drag things in Editor or direct to windows folders.

However, after the game is packaged. All things are becoming one file. Have no clue to add new things.

Any help is thankful! thank you!