Edo78

I'm not sure about the "audiobooks" part but you can use your browser from android to connect to calibre https://manual.calibre-ebook.com/faq.html#over-the-air

BTW I used for many years Moon+ Reader to read aloud my ebook on android. Not quite as a real audiobook but good enough https://play.google.com/store/apps/details?id=com.flyersoft.moonreader

If you are able to see every recipe I'd rule out data corruption. If the issue arise only when try to create a new recipe (or editing an old one) the usual thing to check are permissions. Don't zip but use some tools to maintain permissions (tar, rsync, etc) and try again