It works. But it’s tedious.
Here’s a blog post draft about OPDS feeds, written for a general audience interested in e-books, self-hosting, or digital libraries. OPDS Feeds: The Secret Superhighway for Your E‑Book Library opds feed
We’ve all been there. You find a great free e‑book online, download the EPUB, plug your phone into your computer (or email it to yourself), and manually copy it into your reading app. Then you repeat the process for the next book. It works