I get this authentication message when I try to download a model via Google Drive in the iRhino3D app for iphone.
How can this be overcome?
I'm working on a fix for this issue right now. It's coming along well. I hope to submit an update to the iOS App Store soon. Sorry for the inconvenience.
This issue should be fixed in the recently published 2.2 update to iRhino 3D. Please let me know if it is not working once you update to the latest version.
I'll give it a try!