Calibre

I have my calibre synced from pc to Nextcloud and use the android app to link them together.

I mostly read reference books - recipes, photography, history - so I don't need, or have the space to keep the books on my mobile phone.

This works great however, what I'd really like to do is read my books without having to download them first.

I guess I'm looking for a lazy approach to reading my reference books without storing them all on my phone.

Anyone have any different approaches that I can learn from?