This is not a support request as opposed to a feature request. I have noticed that Google Drive and Dropbox both offer “Save to…” web buttons, which allow for you to save documents directly to your Google Drive or Dropbox account. I am wondering, with the APIs being readily available, if this would be a feature you would be looking to integrate in the short term future, even as an add-on. Would this be something to look in to?
Google Drive: https://developers.google.com/drive/savetodrive
Dropbox: https://www.dropbox.com/developers/dropins