I have stories that were previously published in anthologies and books. These "used" stories are sitting around doing nothing. So I'm publishing them on kdp because a previously published story sitting around doing nothing doesn't do me any good. I have the rights to my stories under the terms of the contracts I have signed. So that's all kosher.
My question is about kdp select. These short stories exist in other media--anthologies and magazines.
Can I or should I not sign up for kdp select?
Or is there a conflict between my solo kdp story and this story still existing within these other media which are for sale in other venues that would prevent joining kdp select?