Currently Being ModeratedSep 20, 2013 7:17 PM (in response to oriaudiobook)
I don't know about uploading an audio book TO the app store, but I know I can add an audio book to my iPhone without using the Audible App on my iPhone. Just hard wire the iPhone to the computer you have iTunes on, go to the "Books" category, and drag and drop the books you want onto your iPhone. However, to ACCESS them, it seems you still have to use the Audible App, but you'll find within it 3 tabs at the top: Cloud, Device, iTunes. You can find the books on the iTunes tab. They will not show up on "Device".
I would like to add that first Audible updated their app recently then even more recently iTunes updated and I am now having a serious problem accessing my audio books through the Audible App.
I don't know if that answers your question, and it's certainly a very late answering, seeing the date on your post.