Would you be able to show me how to do this? I have screenshots from Books with an epub (non DRM) of my own after tapping “Share” but I’m unable to get into either Files or AirDrop. Neither option is displayed so if others can do it, clearly I’m missing something :)

Here are my screenshots:

https://imgur.com/LFgwvTm

https://imgur.com/ZQtcX9e

https://imgur.com/x6A7kjU

As an avid reader, it’s far too limited for my usage. I want to be able to Share/AirDrop books from one device to another (books I own in open source epub, not DRM books).

I want to be able to change the font, add custom fonts, use custom themes, adjust margin width, line height, etc. I can’t do any of this in Books. I used to be a Marvin 3 user, but that got abandoned so I moved on to MapleRead SE and have been using that for the past few years.