To attach pics that way, they've got to be stored on the web somewhere that you can link from directly into the post.
A lot of us have our own websites with space for storage, and there are sites available with free storage.
Some of these free sites don't allow you to remote link pics, though...
Anyhow, if you see a pic in someone's sig line, like my AR firing guy below, he's linked to from my personal website.
Flyer
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