To my dismay I discovered that text content of markdown (.md / .markdown) files is not searchable through the web / mobile app.
Plain-text content of many file formats (.pdf, .txt, etc.) is already searchable so this feels like somewhat of a glaring oversight, seeing as markdown has become ubiquitous in software and tech spaces as a common file format for developer documentation, as well as widely used by note-taking / journaling platforms (Evernote, Obsidian, etc.).
Since they are essentially plain-text files, this would be a drop-dead easy feature to implement, as the feature is already built. It would simply involve adding markdown file extensions (.md and .markdown) to the list of plain-text files catalogued by the indexing routine that Dropbox already performs.