When editing or creating a new document, the markdown preview is available only in the desktop (wide screen) layout. I suspect the UI has some sort of media queries that make the DOM body different on each device.Most important button missing is probably the preview button:
###Steps to reproduce{F4013262}
(From Desktop Devices)
1. Try to edit any document
2. Resize until the UI layout changes
3. Reload the pageCurrent version of `secure.`.
(From Mobile/Tablet Devices)
1.Chrome 56 on Windows and Android, Try to edit any documentand the current Edge browser on Windows).