OneDrive syncing of the Documents folder can sometimes lock the game's save directory. Disconnecting or signing out before playing can prevent this. :
If the folder exists but the game still won't save, Windows Security is blocking the game from writing files. prototype 2 failed to save data fix exclusive
Standard fixes you find on Steam forums—like "run as administrator"—only work half the time. In this exclusive deep-dive, we will go beyond the basics. We will dissect why the error happens, then provide the that actually work, including a registry tweak and a Windows SID mapping trick you won't find in the official support docs. OneDrive syncing of the Documents folder can sometimes