I'm only a newbie but have found these links (below) helped me greatly with loading data from Google Docs
Keep in mind that there is security around Google Docs depending on whether you are using a Corporate or Personal account. I have found no problem with loading data from my Personal Google Drive from home or office. But I can only load data from our Corporate Google Drive when in the office. Selecting "Off - Specific People" doesn't seem to work.
Hope this helps.