Do the stories posted here need to be entirely new content, or are mixes acceptable?
E.g., "I wrote a scene X and posted it to another forum some time ago; now I want to expand it into a full-length story for Challenge A"; or its variation "I was halfway through my story for Challenge B when I realized that part Y of it would be a perfect standalone to post to some other forum's challenge, before I finish the entire thing and post it here"; or, more tenuous, "I've never been happy about my story Z; can I rewrite it for Challenge C?" Things like that, where the result would be more than just a sequel to a preexisting story (and would in fact include at least some new content).