This is how you can attach a file (video, image, document, etc) to a post in the forum:

  1. Click on “New Reply”, “New Thread”, “Go to Full Reply”, or “Edit” -> “Full Edit” to add a file to an existing post
  2. Scroll down to “Attachments” section
  3. Click “Browse…”
  4. Select up to 20 files
  5. Click “Add attachment”
  6. If you want you can “Insert attachments” into specific places of your post
  7. Click “Post reply”

See screenshots below.