Mine says "Can't post attachments" also, but you notice that some of the posts contain photos/images, and some contain links.
I am rather curious about this also. A while this same question came up, and some people responded with photos/images, and some responded with links that open up when clicked on.
Makes one wonder. Maybe Krom and Striker29 will tell us how they post without a link showing up.
This makes my brain really to start spinni'n around, you CAN post directly from your PC, just look at this attached pic's and the adress is in the forum directly.