How to upload multiple files using dropzone with inside sweetalert2

I want to upload multiple files using Dropzone html in sweetalert2.
Problem is when i run query dropzone not working in sweetalert2.

$(document).on('click', '.smt_attachment', function (e) {
        e.preventDefault();
        var itemId = $(this).data('id');
        swal({
            title: 'Dropzone File Upload',
            html:''+
                '<form action="#" class="dropzone" id="dropzone">'+
                    '<div class="fallback">'+
                        '<input name="file" type="file" multiple />'+
                    '</div>'+
                '</form>',
            confirmButtonText: "Upload",
            allowOutsideClick: true
        })
    });

screenshot for popup