Info For Update / Release

Hi all , this is my first post over there Very Excited :slight_smile: Hi everyone!!!
How about release?
If i Compile my project as a final product for windows (Game for steam) , how could i release update for it on the store?
Like bug fixing / Add levels and more?
I try to explain as well but i’m not english , and my accent is really bad :frowning:

I know that i must re upload my product over steam , ok , but how can i upload only 20-30-40Mb over there?
Or i must re-upload the full game?

I therefore thank in advance all those who are due to take the floor and once again express my thanks to the wonderful community and dev Teams!

Have a nice day UE4 Addict!