As long as saves are allowed in a game, the quick save button will be there (shown below):
To use it, all you have to do is click it. It will pop up a modal that tells you that you’re going to overwrite your quick save slot (even if there’s nothing there, lol).
You’ll notice that the above shows that it’s a local quicksave. If you’re logged in, you can quicksave to the server.
Once you have your quicksave saved, you can overwrite it again with a click, or load your last quicksave. First, click “Saved Games”:
The quicksave slot will be at the top of your saves (whether on local or server). Just click “Load” and it will load the save.
Note: just like with other saves, you can’t save on the initial screen. When I tried to save the above slot, it failed. I had to proceed a screen to get a save.
@AChubbyBlackCat This is probably one of the posts you will want to pin. I’ll put up more user instructions/docs later to help.