You can delete a pending track import by sending in the delete command with an
update_id (if it was an update to an existing track). If you send
upload_id=ALL, then we’ll clear the entire import queue, uploads and updates.
|upload_id||yes*||The id of the upload you wish to delete. Specify
|update_id||yes*||The id of the update you wish to delete|
* One or the other is required