At this time, iRhino can open model files from Google Drive, Dropbox and a web address (as well as models being imported through iTunes). Models as email attachments can also be shared to iRhino. However, models in the iCloud drive (new with iOS 9) return an error message Open URL Error when trying to share them from there.
Wouldn’t it be great to have iCloud drive integration in the app? One would imagine it to be less complicated to implement than the existing drive options.