Instead of that link I recommend to upload it using the "Upload a FIle" button and include it into your post by the "Full" button which appears after you uploaded the file.
thanks for the advice i tried it before but its not work i dunno why may be im a newbie here
i upload a file then when 100% nothing happen, when im click post reply no pic shown lol
I pressed the "Upload a File" button and selected the file on my harddisk (I've download it before from DMM).
Maybe I should add that if you didn't change the preferences an Flash uploader will be used. Means you should have an actual version of Adobe Flash installed in your system.
Then the uploader started to upload the picture. You get the progress bar for each file you selected (you can select more than one file at a time).
Afterwards the progress bar will disappear and you get 3 buttons: "Thumbnail" which adds a thumbnail link at the end of your post, "Full Image" which adds the a link to the full image at the end of your post and "Delete" which deletes the attachment / the uploaded file.
Here I press "Full Image" and got the link in the post. And as you can see it is working.
Maybe your connection is too slow and you have to wait for a moment. Or the load was very high on the forum at that moment. But after AO moved to the new server and is now running even on two servers I didn't face such problems at all.