I have an audiobook application, I have downloaded audiobooks which are only accessible inside application, and last time I checked I was able to find audio files of books in my phone's music folder, but now that I have updated the application I cannot find any files in my whole phone's internal memory, although in application I can see the books are downloaded and I can listen to them. There is also an option of "deleting files from phone" near each book's section.
Now my question: how can I find audio files of the books in my phone's storage? My phone is Samsung galaxy A8+ and android version 9.0.
PS: I have already paid for the book so this is not thievery!