I downloaded your avatar (full size, over 1.1mb) by right clicking on it, cropped it to a square, and resized it here to 80x80 pixels required for your avatar. You can right click it, download it, and it should work fine for your avatar, if you wish.
Loading an attachment (above) is much the same as attaching a file to e-mail. It's just limited to 1mb in size, or it won't finish the upload.
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