Do discussion messages support file attachments? How do I send them?

Yes. In the discussion input box, there are three ways: 1. Click [Attach Files] in the toolbar and select a file. 2. Drag a file directly into the input box. 3. Copy a file or take a screenshot, then paste it in the input box. A single file can be up to 100MB with no file type restrictions. HTML and .md files can be previewed directly in the right panel. Keep in mind: - All people who joined this discussion thread can see all messages and attachments, including those sent before they joined. - Messages cannot be deleted after sending, and attachments cannot be deleted either. If you send something by mistake, post an explanation in the same thread. Orders themselves don't have a "Document Attachments" field. For files related to a specific document, it's recommended to send them in that document's [Discussion], so you can easily find them later when opening that document.