The *.sav file
The file format that is used by Unreal Engine in order to store the saved data is the *.sav file. You can find all the save files (files named with the slot names you use within the C++ code) in the SaveGames directory, within the game or the project.
As you can see, Bellz's save game directory contains only one file, which is called CoinSaveSlot.sav, the name of the slot I defined earlier. That means you can not only save multiple values within one save file, but you can also save more than one save file. So you can think of a single save file as a table of values, and the save directory as the container of all the tables. And while you've got the chance to save unlimited amounts of save files, it always better to keep things organized within one file or even a few save files, in order to avoid any corruption or complications. Check any AAA game (the Batman Arkham series, for example) made with Unreal Engine, and you will find it has around three save files. Also...
