GottaBeMobile offers a better explanation
than many other reports
of a recent Google upgrade (some users would say more of a lateral move) that makes offline document creation and editing a first-class option for users of Google's office apps, but removes editing capabilities from Google Drive per se. Instead of creating or editing documents directly through Drive, users will instead be able to do this (including offline) with a dedicated app called Docs and Sheets. The article explains a few ways in which the new configuration is confusing, including this one: "Splitting out the editing functionality from Google Drive into the new Apps certainly seems odd given that fundamentally there are no new or different editing features offered in the new Google Docs and Google Sheets standalone Apps. Some users won’t appreciate having to download the new stand alone Apps to replace previous functionality, especially limited functionality."