Joplin. I have it as a sync server. But have it tucked away in a cloud server for the times when I’m traveling so j always have a way to access data in case my phone gets stolen/confiscated.

This is pretty neat!

https://storyteller-platform.gitlab.io/storyteller/docs/intro/what-is-this

Sounds like you need both the audio and the ebook to make it work?

I typically only have one or the other.