How to add .sav files into a directory when creating them?

I am currently trying to put a .sav file inside a directory so I can add it into a steam workshop item. It does not allow me to add the item directly and is requiring me to put it into a folder. I am currently using version 5.3 and i also tried adding / into the save file name. “levelname/customlevel.sav” for example. that does not work either. Does anyone have any ideas on what I can do?