The non-Steam version of Satisfactory can be made to work with SaveSync. Here are the steps:
- Disable cloud saves for the game on Epic Games or your respective storefront
- In Steam, navigate to: Library -> SaveSync -> Settings -> Properties -> Installed Files
- Click on Browse
- Create a new text file named 526870.txt
- Add the following lines to the file (be sure to update the paths to match your machine): C:\\Games\\Satisfactory
WinAppDataLocal
FactoryGame/Saved/SaveGames/<id>