The user needs to be able to open SharePoint site in the same browser as Business Central without being prompted to login. If they are prompted, DocXtender will not be able to connect automatically. The login is just cached in a browser SharePoint cookie, nothing is stored in Business Central. This is exactly the same as if you log into SharePoint and use the “remember me” option. Running in a private window or different browser, or logging out of the Microsoft login, will prompt you to log into SharePoint again. If the browser cannot save the SharePoint login it may not be able to retrieve the link after the file is sent and they will not be able to use SharePoint to save attachments.