Message ->group member is not having the Dowload link.

Login as Group admin and attach an image for a message. He is having link for the file name as well as Download link.
Here, clicking on the Dowload link will show a File Download window. & clicking on the image link takes the user to another page where the image alone will be displayed.

If another user ( group memeber) clicks the attachment, he is not having the Dowload link. But he is having the link for the image name.

(tested in dev)