With the latest version of the Overcast podcast app for iOS, you can upload your own files. So why not use the app for audiobooks?
For some reason, Audible includes really low-resolution artwork with its downloads. Here’s how to fix it (it’s not as easy as you think).
You can use a number of different apps to listen to audiobooks on iOS.
No point trying to view your audiobooks by author in the latest version of iTunes.