Beatport only sells individual tracks which are complete and unmixed (not cut from a continuous DJ mix/set). A complete track is a standalone track that should have a proper intro and outro that a DJ can integrate into their set or mix at their discretion.
Therefore a DJ mix must be provided as an "album-only" or "mix-only" product and the tracks within that mix cannot be sold individually if they are simply cut from the continuous mix.
It is perfectly acceptable to deliver a compilation of unmixed tracks for individual sale with a DJ mix of those tracks included as an additional "album-only" track.
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