Also I'm a little unclear on where tags from within the document show up, how you'd make tags akin to the chapter 1, chapter 2, etc shown in a screenshot on the product page, and how those differentiate from the outline tab.
Tags in deepdwn exist at the document level only, to help organize files together which share the same tag.
In the product page screenshot, there are multiple markdown files (titled "chapter one", "chapter two", etc) which all have a common tag in their document metadata.
Hope that makes sense. Let me know if you have any questions about it!