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Track deletion restrictions
One of the core concepts of wikiloops is to offer all remix stages as they evolve, and to order them in branches resembling the collaborations progress as explained here.
This ordering concept requires that tracks which have been remixed may no longer be removed from the branch of consecutive remixes, because that would lead to the remixes "dangling in the air" without any connection to their previous step.
The only way to prevent a major mess-up of the collaborations structure would be to delete all remixes as well, and that would not be fair to the musicians who took the time to create those.
Deleting a mis-happed upload
To delete any non-remixed tracks of yours, follow these steps:
"Thank you for this wonderful opportunity to explore, learn and co-create internationally at any time of day! :D"