Im sorry to have to write that Byword has been barely usable since iOS 8 upgrade. Things I type on my Mac Mini or MacBook, I can open files through iCloud Drive from any of the two Macs (both Yosemite). But the creation of a file on a Mac seems to be randomly synchronised to and from iPad Retina, iPad mini or iPhone. Either the new file is not listed at all when browsing through iCloud Drive from iOS devices, or it is listed but the content takes ages to show up, or editing makes the app crash.
I am starting to give up on this software. Writing with it has become a source of technical anxiety, so to speak. Hopefully updating each and every fix update. Deleting the app, reinstalling it, ticking off iCloud sync and reenabling it will do nothing reliably efficient.
Too bad, because Byword is my markdown editor of choice. I am starting to prospect for alternatives. iA Writer and the likes.
Heraclitus about Byword, v2.3.2