Not OP, but taking this approach doesn't give you tls, the browser will complain the connection is not secure (even though it is because of Tailscale)

Then I'll give it another try. Thanks for your response.

Is it? Last time I tried it, it gave me lots of issues. It didn't show many books' covers, had lots of issues when resuming reading, among other things. I do use AudioBookShelf to manage my podcasts, which it does an amazing job. Guess I'll try it's ebook capabilities again.