Content Authoring (PAID)
Content Authoring document editing online allows users to edit Microsoft Word, Excel, and PowerPoint documents without downloading them to S-Drive. For more information on this feature, see Content Authoring - Microsoft Office Integration(Paid feature)
This feature is available in Lightning Experience only. If you have users in your organization who uses S-Drive in both Lightning and Classic, a file locked for editing in Lightning may not show as locked in Classic.
To configure Content Authoring: