If you are in First Release, SharePoint Online is offering you the ability to see the "new look" of document libraries. When using the new look, I see no way to access the ribbon. This means I cannot access Nintex for O365. (It also means I cannot get to the Edit Library, Connect to Outlook, Connect to Office, Export to Excel, RSS Feed, Email a Link, and Most Popular Items ribbon commands...)
I understand that the new look is currently optional and you can easily click on "Return to classic SharePoint". I'm wondering what the process for creating/editing Nintex workflows will be like when the new look is no longer optional. When using the new look for doc libraries, does anyone know how to access and modify a Nintex for O365 workflow connected to the doc library?