FormData jQuery AJAX Returning Null

I am trying to use FormData() for sending texts and images. It's not working

$('#saveBtn').click(function(e) {
        e.preventDefault();
        $.ajaxSetup({
            headers: {
                'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')
            }
        });

        var formDataEdit = new FormData();

        //formDataEdit.append('images', $('#images')[0].files[0]); // for single item
        formDataEdit.append('nameForEdit', $("input[name='nameForEdit']")
            .val());
        formDataEdit.append('codeForEdit', $('#codeForEdit').val());
        formDataEdit.append('categoriesForEdit', $('#categoriesForEdit').val());
        formDataEdit.append('stokForEdit', $('#stokForEdit').val());

        let TotalImages = $('#photoForEdit')[0].files.length; //Total Images
        let images = $('#photoForEdit')[0];
        for (let i = 0; i < TotalImages; i++) {
            formDataEdit.append('images' + i, images.files[i]);
        }
        formDataEdit.append('TotalImages', TotalImages);

        console.log(formDataEdit.get('nameForEdit')); // it's works, returning the value of name. 
        console.log(formDataEdit.append('codeForEdit', $('#codeForEdit')
            .val())); // it's not working. Returning undefined. */

        $.ajax({
            url: "products/" + id,
            method: 'PUT',
            data: formDataEdit,
            enctype: 'multipart/form-data',
            cache: false,
            contentType: false,
            processData: false,
            dataType: 'JSON',
            async: true,
            headers: {
                'Content-Type': undefined,
            },
            xhr: function() {
                myXhr = $.ajaxSettings.xhr();
                return myXhr;
            },
            success: function(result) {
                if (result.errors) {
                    $('.alert-danger').html('An error in your input fields');
                    $.each(result.errors, function(key, value) {
                        $('.alert-danger').show();
                        $('.alert-danger').append('<strong><li>' + value +
                            '</li></strong>');
                    });
                } else {
                    $('.alert-danger').hide();
                    $('.alert-success').show();
                    $('.datatable').DataTable().ajax.reload();
                    setInterval(function() {
                        $('.alert-success').hide();
                        $('#ajaxModel').hide();
                        location.reload();
                    }, 2000);
                }
            },
            error: function(response) {
                $('#codeError').text(response.responseJSON.errors.code);
                $('.alert-danger').html('An error in your input fields');
                $.each(response.errors, function(key, value) {
                    $('.alert-danger').show();
                    $('.alert-danger').append('<strong><li>' + value +
                        '</li></strong>');
                });
            }
        });
    });

Everytime I use dd($request->get('stokForEdit')) for example, it's returning null

But, when I change code to below without FormData(), it's working.

url: "products/" + id,
        method: 'PUT',
        data: {
                nameForEdit: $('#nameForEdit').val(),
                codeForEdit: $('#codeForEdit').val(),
                categoriesForEdit: $('#categoriesForEdit').val(),
                stokForEdit: $('#stokForEdit').val(),
        },
        enctype: 'multipart/form-data',
        cache: false,
        //contentType: false,
        //processData: false,
        dataType: 'JSON',
        async: true,
        headers: {
            'Content-Type': undefined,
        },
        xhr: function() {
            myXhr = $.ajaxSettings.xhr();
            return myXhr;
        },

I can't use the second way, because I need to send an images. Help me with the soultion!

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