We are using old Dropbox (classic API) and GoogleDrive systems in iRhino 3D. It's in dire need of an update. I've got this on the TODO list (IR-486)...along with iCloud Drive support, Box, OneDrive and ...? What else?
Also, I'm curious if this "classic" behavior is something that some people would want to keep around? Or should we just switch to the newer paradigm of always keeping the file in sync?