Every picture you post, will give you an IMG tag, or a direct link.
You can use the direct link.
Type in <IMG SRC="LINK HERE"> in caption. You can try adding a third if you'd like (depends link length) by typing in <BR> afterwards, which is a line break, then the IMG tag again.
Also, if you're scanning it, you can place two pictures at once, and they'll be attached to one.
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