title: Open Office 365 Word Document for Editing with Save Callback
body: <p>Is it possible to open an WORD/EXCEL/POWERPOINT document in an external application to edit it and subscribes to an callback when the document is successfully saved?</p>
  
  <p>Through the Microsoft Graph API you can read from your SHAREPOINT docs but i want to implement a "edit online" button. It should redirect or open an popup to the online viewer in edit mode. i've couldn't find anything (only an example for generating an excel document and save it to one drive)</p>