The Bible.is app is a self contained app. When an Audio Bible is downloaded from the app to the device, the audio files are stored on your device within the app. The audio files are not made to go outside of the app, but held within.
If you are interested in having our Audio Bibles for use outside of the app, I would recommend our Audio Bible Downloader program. From your computer, you can download the Audio Bible of your choice and copy it on to your device, like you would any music file. Likewise, these files will play on your device in a media player and not inside the Bible.is app. In other words, there is no integration between the online audio files and the app on your mobile device.
If you feel you need extra help, you're welcome to contact our Bible.is Support Team.