The idea of cloud docs is wonderful, but the reality is intensely frustrating.

File created in the studio; a simple text logo. Retun home need to make a change. Impossible to open.

"Make file available offline" Done. Still impossible to open.

Identical version of Illustrator on both Macs. Multiple occurrences. It has happened in reverse too

Workaround > Store files on a disk. Transfer manually. (Not what Adobe want to hear!)

I should add that this a a regular problem on PS too, so a broader Creative Cloud, issue. Oh and the internet connection is Gigabit, so not a speed issue.