Over a day later and it still doesn't not work. The article is published, but there is a serious bug in the code which will annoy users. I was able to add a comment with the fix, but not update the article with a new ZIP file. The ZIP is less than 100 Kb so is fine sizewise.
The last 2 images do not show up in the published article but they showed up in the preview. The problem could be the width is not set in style attribute: I did set them but the width is removed after published, leaving the height only.