Do something after file upload

functions.php

<?php

/*
$target_path= full path of uploaded file (not yet inserted into db)
$uid = the ID of the user uploading the file
*/
add_action('sp_cdm_after_file_upload','my_file_insert',10,3);

function my_file_insert($target_path,$uid){

  if(my_custom_check_file($target_path) == false){
   unlink($target_path);
   die('{"OK": 0, "info": "File did not pass my custom check"}'); 
  }
 
}