The string of characters in "AUD-20221008-WA0004" serves as a unique identifier for the media:
: This is a sequential counter indicating it was the fifth audio file processed by WhatsApp on that specific day (the counter typically starts at 0000).
: Indicates the file type is Audio . Other prefixes include "IMG" for images, "VID" for videos, and "PTT" for "Push to Talk" voice notes.