[PilcrowandStanza]

Hi all,

Book designer here. Still struggling with the ebook end of things.
I'm having trouble getting my epub3 files to work on epub2-only readers/apps

I'm exporting from InDesign, then cleaning things up in Sigil
(I'm a print-first designer). My understanding was that epub3 files automatically downgrade to epub2 where 3 isn't supported, but that doesn't seem to be the case.

For example, on my Mac, the epub3 automatically opens in Books, which does not seem to support that format because the page breaks are missing, but if I export it as epub2, it looks fine.

So, is there something missing to ensure that files downgrade to epub2? An if/then kind of thing? (I'm a coding n00b, sorry)

Note that I mostly want the accessibility features (screen-reading, etc) to be available to those who need it. Also, the pop-up footnote thing is handy.

All tips, tricks, advice, clear instructions welcome.

Thanks!