Markdown preview is activated in the premium version. You can refer to the syntax from Daringfireball. Alternatively, you can also access the Markdown shortcuts “#M” at the bottom toolbar of the editor.
The supported Markdown syntaxes are as follow:
# Heading 1
## Heading 2
### Heading 3 (up to Heading 6)
* Unordered list item
1. Numbered list item
Please note that we do not officially support Markdown syntax that are not listed above.