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The File Uploads feature is great for any audiobooks you may have that you downloaded from a service other than Audible (which has its own app) or that you created yourself from CDs that you own.
You get all the same Overcast features for audiobooks as you get with podcasts. Overcast recognizes the chapter marks, remembers your last-played location (synced across the iOS app and the website player), and you can enhance the playback with Smart Speed and Voice Boost.
