You can't officially do a remote upload from RS to RS, but there may be work arounds. I read that you could use services link tinyurl and paste the original RS link as a tiny url, and upload to RS like that, haven't tested though (couln't find and url shortening services that did multiple links to multiple links.).

Not entirely sure what you are looking for, but most hosts lets you do remote uploads from other hosts. So you could do RS to Hotfile. And if you insist on having RS links you can just do a remote upload back from Hotfile to RS.