.pdf or jpg works fine. You can always link to them if hosted elsewhere. There is a size limit, but cannot remember what it is... Anyway some instructions, 1. Click blue link "Attach a file" below you post 2. Click "Choose File" button 3. Box opens with your desktop files. 4. Highlight the one file you want to upload, and click Choose button 5. You can then opt to have an image appear as part of the post.
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