* That's not possible to change MD5 for file. If hosts checks MD5 after uploading you will get error from host that MD5 does not match. You will need to archive. 99% of the hosts don't check MD5 at all since I'm not even sending any MD5 information to hosts since they don't require that.
* You're changing wrong template. You need to change "{#hostsLinks#}" template (not "{#links#}"). It's in different tab (one on the right):
Freddy. - another question about pictures and screenshots - can I upload photos (one post) to several hosting? For example, one post 2 - 3 (identical) pictures are loaded on different hosting, as well as screenshots?