Hi mahesh213,
Refer below code.
Controller
public class HomeController : Controller
{
    // GET: Home
    public ActionResult Index()
    {
        return View();
    }
    public JsonResult GetCustomers()
    {
        List<Customer> customers = new List<Customer>();
        customers.Add(new Customer { Id = 1, Name = "John Hammond" });
        customers.Add(new Customer { Id = 2, Name = "Mudassar Khan" });
        customers.Add(new Customer { Id = 3, Name = "Suzanne Mathews" });
        customers.Add(new Customer { Id = 4, Name = "Robert Schidner" });
        return Json(customers, JsonRequestBehavior.AllowGet);
    }
    [HttpPost]
    public ActionResult Add(IEnumerable<HttpPostedFileBase> files)
    {
        // Do saving task.
        return Content("");
    }
    [HttpPost]
    public ActionResult Save(List<Customer> customers)
    {
        foreach (Customer customer in customers)
        {
            // Do saving task.
            int id = customer.Id;
            string name = customer.Name;
            for (int i = 0; i < customer.Data.Split(',').Length; i++)
            {
                byte[] bytes = Convert.FromBase64String(customer.Data.Split(',')[i]);
                // Code for saving each uploaded file for the customer.
            }
        }
        return Content("Success");
    }
    public class Customer
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public string Data { get; set; }
    }
}
View
@{
    Layout = null;
}
<!DOCTYPE html>
<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Index</title>
    <link rel="stylesheet" href="http://kendo.cdn.telerik.com/2016.3.1028/styles/kendo.common.min.css" />
    <link rel="stylesheet" href="http://kendo.cdn.telerik.com/2016.3.1028/styles/kendo.rtl.min.css" />
    <link rel="stylesheet" href="http://kendo.cdn.telerik.com/2016.3.1028/styles/kendo.silver.min.css" />
    <link rel="stylesheet" href="http://kendo.cdn.telerik.com/2016.3.1028/styles/kendo.mobile.all.min.css" />
    <link rel="stylesheet" href="https://kendo.cdn.telerik.com/2020.1.114/styles/kendo.default-v2.min.css" />
    <script type="text/javascript" src="https://code.jquery.com/jquery-1.12.4.min.js"></script>
    <script type="text/javascript" src="https://kendo.cdn.telerik.com/2020.1.114/js/angular.min.js"></script>
    <script type="text/javascript" src="https://kendo.cdn.telerik.com/2020.1.114/js/kendo.all.min.js"></script>
    <script type="text/javascript">
        var app = angular.module("MyApp", ["kendo.directives"]);
        app.controller("MyController", function ($scope) {
            ApplyKendoGrid();
            function ApplyKendoGrid() {
                $scope.mainGridOptions = {
                    dataSource: { transport: { read: "/Home/GetCustomers/" }, pageSize: 5 },
                    pageable: { refresh: true, pageSizes: [2, 25, 50] },
                    groupable: false,
                    sortable: true,
                    columns: [
                        { field: "Id", title: "Id" },
                        { field: "Name", title: "Name" },
                        {
                            field: "UploadFiles",
                            template: '<input id="fuUpload" type="file" name="files" class="fileUpload" />'
                                + '<input id="hfData" type="hidden" class="hfData" />'
                        }
                    ],
                    dataBound: function (e) {
                        var grid = e.sender;
                        var items = e.sender.items();
                        items.each(function (e) {
                            var dataItem = grid.dataItem(this);
                            var fuUpload = $(this).find('.fileUpload');
                            var hiddenData = $(this).find('.hfData');
                            $(fuUpload).kendoUpload({
                                multiple: true,
                                async: {
                                    saveUrl: '@Url.Action("Add", "Home")',
                                    autoUpload: true
                                },
                                upload: function (e) {
                                    var reader = new FileReader();
                                    reader.onload = function (e) {
                                        var bytes = e.target.result;
                                        if ($(hiddenData).val() == '') {
                                            $(hiddenData).val(bytes.replace('data:image/jpeg;base64,', ''));
                                        } else {
                                            $(hiddenData).val($(hiddenData).val() + "," + bytes.replace('data:image/jpeg;base64,', ''));
                                        }
                                    }
                                    reader.readAsDataURL(e.files[0].rawFile);
                                }
                            })
                        });
                    }
                };
            }
            $scope.OnSave = function () {
                var rows = [];
                // Loop through each row and send the hiddenfield with row data to controller.
                $.each($("#tblCustomers tbody tr"), function () {
                    var row = {};
                    row.Id = $(this).find('td').eq(0).find('.ng-binding').html()
                    row.Name = $(this).find('td').eq(1).find('.ng-binding').html()
                    row.Data = $(this).find('.hfData').val();
                    rows.push(row);
                });
                var post = $http({
                    method: "POST",
                    url: "/Home/Save",
                    dataType: 'json',
                    data: JSON.stringify(rows),
                    headers: { "Content-Type": "application/json" }
                });
                post.success(function (data, status) {
                });
                post.error(function (data, status) {
                    $window.alert(data.Message);
                });
            }
        })
    </script>
</head>
<body ng-app="MyApp" ng-controller="MyController">
    <kendo-grid k-options="mainGridOptions" id="tblCustomers"></kendo-grid>
    <input type="submit" value="Submit" ng-click="OnSave()" />
</body>
</html>