Help setting up Snapshot Pro with Google Drive

Hi, having some trouble setting up the snapshot pro with google drive.

this is the settings page and the instructions up to step 4
- http://take.ms/aw861
this is what i see in the credentials page on google side. - http://take.ms/rzLnE and this is the drop down - http://take.ms/V3P3lt

Perhaps some clearer instructions can also be added to the plugin ?
Thanks
Tom