Uploading to Steam - BeardedManStudios/ForgeNetworkingRemastered GitHub Wiki

Pretty much this video https://www.youtube.com/watch?v=rK5Fr5hhslM

I will note the differences

It is an outdated video, but it works great, and is a far better visual aid than this text.

Make a build, but make sure the build's name, is the same as what steam expects. See the image below. I name my steam builds "[GameTitle]Steam.exe"
15

Tools>ContentBuilder>Scripts
Should have different contents than you. You should have 4, instead of 2. Regardless, just replace the appID with your game's appID in all these files. And for the depot, do the same (find depot ID by going into your browser and your game, then SteamPipe>Depots)
It should be your id + 1 by default.
Don't forget to rename them, to match the proper ID btw!

Everything else is pretty much the same. It could be faster, and he does shill his game a bit much, but the video fully explains how to build.

Please note that steam depots are like git. They notice diffs, and so, only the first build takes time to upload.
So, the process to test should be pretty smooth.
If you did the integration with Steamworks.Facepunch, try logging out and logging in Steam, before opening the game. You should see the steam layout :)