GMS 2 Changing the sprite of a tileset from directory

How do I change the sprite of a tileset? I am trying to replace my tileset´s sprite with a tileset in my working directory.

sprite_replace and sprite_add is not working.

Tested in draw event and step event:

Code:

if keyboard_check_pressed(ord("R"))
{
    sprite_add(working_directory + "tile.png",-1,true,true,16,16);
    sprite_replace(spr_tropical_tileset,working_directory + "tile.png",-1,true,true,16,16);
}

It works if you want to change an object but I want to change the tileset, not the object.