Well that would not work as there is no place to upload images for the article submission. You can usually only take URLs of images into articles. So for that you need to upload them somewhere and use the macro <img src="%spinfile-c:\image_urls.txt%" /> in the article and fill that file with the full URLs of the images.
Of course not all engines support images in posts. BuddyPress e.g. does not most wikis do just display the image url instead but a lot actually allow it.
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