Steam updating steam extracting package
Note that after your app releases to customers, your customers will be receiving the build marked as the Default build.
In order to test your update, you should upload the new build using Steampipe, then set that build on a test branch with a password to test before moving it to the default branch.
Your own approach may vary as you learn what your players are responding positively to.
If you created new depots in the process of adding this new content, make sure you add that new depot to all store and key packages. Once you're ready to release your update on Steam, you'll want to tell customers and provide a place for focused feedback.You can sell it as Downloadable content (DLC) or as in-game purchases.