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
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