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I did see that you were able to get 2 pics in one post. The problem there is after you insert a pic you need to hit enter a few times to space them out.
Click at the bottom right hand corner, until you see a blinking cursor.(you may have to scroll over)
The little white outline boxes will go away when cursor is blinking. The hit enter.
You can also use the preview message to see how the post will come out.