Ad-hoc camunda-element creation issue

It works. Here is my code if someone would ever be interested

       $scope.uploadFile = function(fileName) {
            if (document.getElementById(fileName).files[0] && document.getElementById(fileName).files[0].size > 0) {
                var formData = new FormData();
                formData.append('data', document.getElementById(fileName).files[0]);
                formData.append('valueType', 'File');
                $http.post('/engine-rest/task/' + $scope.camForm.taskId + '/variables/'+ fileName +'/data', formData, {transformRequest: angular.identity, headers: {'Content-Type': undefined}});
            }
        };
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