Hi George, have been to your site, what I'd done was pick an image, right click, save image as, the options are yours as to where or which file on desktop you save it too, then here make the thread, scroll down to Additional Option, Attach: Browse, find file, open and add image once found.. select additional by (more attachments) .. now to see if it works.. FOR ME ..
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Cheers David
PS.. Size for these images off your website have worked OK ..