Google Drive app: 'Open In' feature not working

Hi all

I have the latest version of Google Drive app (3.0.0.27678) installed on an iPad Air with iOS 7.1.1 and have found that the 'Open In' feature that should allow me to save files from other apps to my Google Drive does not work. I choose Open In for example Keynote, it takes me to Google Drive but then, no dialog to allow me to upload to Google Drive. Other Cloud services are working fine. Can anyone help?