ok first, you should remove the screenshots as they’re not needed to explain what you mean (site policy).
Maybe I’m a little guilty for the previous post, but the visual there is worth a thousand ASCII dashes and slashes trying to show a directory structure.
The audio files do not go anywhere in the ProffieOS folder.
They only go on the SD card, just as you have them.
Don’t confuse the font “common” folder with the Operating System’s “common” folder.
They are unrelated, just unfortunately identically named.