Is it possible to load a map in-game same like use photoshop to open a jpg picture?

After I have built a game and published it to user,I want to add a new scene(map or level whatever) to the game. May I cooked this new map to a single package file in UE4-Editor. Then user downloaded this file from server.And then when user run the game and sepcified the new map’s name and package file’s path and then the game open it! It’s same like I use photoshop open a new picture.

Is it possible above-what-i-said? If not, what can I do for load new map on the published game? Does UE4 support online game update system?

Please help me thanks.