This add-in requires one of the following applications:
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When this add-in is used, it
Using this Beta version you can import Google Drive files to Your SharePoint 2013 site, Where you can edit your Excel and Word Documents using the Office Web Apps.
Be sure that you
1-Enable the popups to be able to authenticate the application
2-Enable the "(Access data sources across domains)" which is disabled by default in IE
Note that the import functionality is working on