Attachments and the document type

A line that is nothing but [label](handbook.pdf) -- a bare filename, whitelisted extension -- makes the file part of the post: it is picked up from incoming/ exactly like a photo, stored in media.nosync/<year>/<slug>/, and rendered as a download card showing the label, the extension and the file's size. A link to an address stays a link; the engine can only publish files it was handed.

Whitelisted: .pdf .zip .tgz .epub .txt .md .ics .gpx .csv (.tar.gz is not, because only the last suffix survives the rename -- use .tgz). A post whose text is a short line plus attachments is filed under DOCUMENTS, which appears in the nav once the first such post exists; a longer article that attaches its data stays an article with a file on it.