[jxdxbx]

Yeah, it's also a better mobile app (at least in terms of not wasting screen real estate) than Apple Books on iOS. However some percentage of books I try to upload just give me an error and the app and web app rarely get any love.

[tiltowait]

Apple Books would easily be the best eBook app if it had smaller (or customizable) margins. It's been a common request for years. Maddening.

[jxdxbx]

Yeah. Margins are an important part of typography, but the "margins" of my phone include a bit of black bezel and some leather case. So text can get closer to the edges of the screen. And wasting phone screen real estate on the title or chapter name on each page is annoying. I'd rather have three extra lines of text.

[charleshan]

You can fix the epub error by converting "epub to epub" in Calibre