- Click the Image icon in the toolbar.
- When the upload window the “Drag files here” appears, drag your 3dm file onto the window.
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Discourse now supports file uploads in addition to image uploads; it is up to the admins to enable this option and set the file extensions that are allowed:
Here are two sample files, uploaded via the “upload” button in the composer. (The tooltip for it still says ‘image’ unfortunately, we will fix that, but give it a shot!)