It is possible to add map attachments to a Markdown document by adding files to a attachments folder at the root of the archive.
When organizing a document using file numbers, users can define what folder contains the document's attachments. To do this, users must add a metadata key named attachment_dir in the root README.md file.
The value of attachment_dir is a folder. Its path should be relative to the root README.md file. The Markdown connector looks for files in this folder, and adds them as map attachments.