You'd have to be more specific.
Sometimes, the picture is just an embedded link to a pic that is somewhere "out there" on the web. If the pic gets moved or deleted, the
thread here on ECF has nothing to link to. This is more and more common...where sites are stopping fair use of pics and using temporary URLs that expire after a short while.
Also, some
threads have attachments linked to a pic in the user's ECF account, but space is limited and the old ones "roll off" after a while.
Others may be removed by a moderator if offensive.
So... example?