You will have to remove any buttons allowing the player to make a save and then take control of saving when needed. To force a save you can make a call to a script to do the saving at the correct time(s) in your Vinoma scenes.
You need to create a function named
ForceSave (or whatever you want to call it) in a script added to the
_CustomScripts_ object. I made a script called
MyFunctions. To make a script, go: menu:
Asset > Create > C# Script. Then double click on the script in Project panel to open it in script editor.
The code of the script will look like this
public class MyFunctions : MonoBehaviour
public void ForceSave()
A limitation is that you must choose which slot to save to, in this case I choose slot 1. It will require more scripting if you want to allow the player to choose an "active" slot when the game starts and then remember that slot to keep saving to it.