I noticed once on one computer that the game Far Cry 4 can not save the game.
Far Cry 4 itself was not installed, but was moved from another computer to the folder + transferred to Save to Documents.
The reason for not saving was probably different owners to the files and directory of the game, this quickest solution is right-clicking on the game’s shortcut, then “Properties” – tab “Compatibility” and setting the checkbox “Run this program as administrator“, click “ОК“.
Done, there should not be any problems with saving.