We have files in Sharepoint Online (and OneDrive) in our O365 tenant, but Sharepoint Online is not used as UI for our internal systems. So now the requirement came up to initiate co-authoring in this web application (drupal).
What should I research to be able to create specific links in the frontend of Drupal next to the file lists to allow word to remotely open the files from Sharepoint Online? All users have O365 logins by the way.
Any tips or hints would be much appreciated. Don't mind adding bounty or paying somebody who can really go into the details.