I have below requirement for Google drive integration(OAuth 2.0 client IDs) with salesforce.
1.Using site,When end user will Create new contact with all required information and when he click on save button he will redirect to Saved contact Detail page and on this page there is one Option to choose the File from google drive. While choosing the file google drive page will pop-up a window for authenticaion. Once authenticaion is done selected file should be saved in that contact notes and attachment related list.
2)Query: After authentication,I am redirect to Authenticated google drive page. currently I am facing issue is after auther authentication it is redirected to vf page.Please find the attchments enter image description here