Audiobookshelf: Self-hosted audiobook and podcast server

How is the Android app? The only good app for local audio-books I know is "Smart AudioBook Player". The web-app GUI in the demo is less than perfect, but kinda ok, if you enable chapter-view. The biggest problem is a single set of ±10 s rewind buttons: for a dedicated audio-book player it's not enough, a separate ±1 min button set is a must. But since the authors didn't think of that, I don't expect it to be different in the Android app. I'm rather asking about mobile-specific features:

1. Does it properly stop the playback when headphones are disconnected?

2. Is there a usable lock-screen widget?

3. Does it auto-rewind after a pause? It's best when the pause duration is taken into account: it shouldn't rewind more than a couple of seconds if you pause for a second, but a whole minute may be better if you left it off yesterday.

4. Does it handle well situations when the server is not accessible? Can you just pre-download a couple of audio-books for your 10 h long flight? I mean, honestly, streaming is never desirable, the only point of a self-hosted server is that you don't have to download and delete your collection manually. It's a tricky problem when the playlist is highly variable (as with music), but for an audio-book player should be a non issue: just pre-fetch a whole book (maybe manually), storage space is a lesser issue than mobile internet.

Do you have any other favorite features from Smart Audiobook Player? I'm building an audiobook app now. I have some unique features unrelated to playback, but I also want it to be an excellent player.

History. I keep losing my place on books with random touches, and I dislike the process of finding it again through sampling. Spoilers! The history feature fixes that.

And the built in equalizer. And the speed shifting. And the file management. It's just a great app.

Thanks. Also how do you get books onto your phone for Smart Audiobook Player in the first place?