Poor cross-device compatibility

Built a Keynote deck in v6.6.2 on my MacBook. Uploaded it to my cloud drive, and get a cannot open for some reason error (which is awesome in its specificity - congrats, Apple!) when trying to open with most up-to-date version of Keynote on my iPad Pro. This is unacceptable; and the formatting is crap when I convert to a Keynote 09 version and try opening that one on my iPad instead. This should be a seamless experience across these two devices and apps. Big thumbs down.

DSalinger about Keynote, v2.6.2