Upload image with ckeditor in mvc core

Hello . I want to upload a picture through CKeditor, but I have a 400 error. Thank you for guidance.

config file

CKEDITOR.editorConfig = function (config) {
    // Define changes to default configuration here. For example:
    // config.uiColor = '#AADC6E';
    config.contentsLangDirection = 'rtl';
    config.language = 'fa';
    config.filebrowserImageUploadUrl = '@Url.Action("ImageUpload")';
    config.toolbar = 'MyToolbar';

    config.toolbar_MyToolbar =
        [
            { name: 'document', items: ['Source', '-', 'Save', 'NewPage', 'DocProps', 'Preview', 'Print', '-', 'Templates'] },
            { name: 'clipboard', items: ['Cut', 'Copy', 'Paste', 'PasteText', 'PasteFromWord', '-', 'Undo', 'Redo'] },
            { name: 'editing', items: ['Find', 'Replace', '-', 'SelectAll', '-', 'SpellChecker', 'Scayt'] },
            { name: 'forms', items: ['Form', 'Checkbox', 'Radio', 'TextField', 'Textarea', 'Select', 'Button', 'ImageButton', 'HiddenField'] },
            { name: 'basicstyles', items: ['Bold', 'Italic', 'Underline', 'Strike', 'Subscript', 'Superscript', '-', 'RemoveFormat'] },
            { name: 'links', items: ['Link', 'Unlink', 'Anchor'] },
            { name: 'colors', items: ['TextColor', 'BGColor'] },
            '/',
            { name: 'insert', items: ['Image', 'Flash', 'Table', 'HorizontalRule', 'Smiley', 'SpecialChar', 'PageBreak', 'Iframe'] },
            { name: 'paragraph', items: ['NumberedList', 'BulletedList', '-', 'Outdent', 'Indent', '-', 'Blockquote', 'CreateDiv', '-', 'JustifyLeft', 'JustifyCenter', 'JustifyRight', 'JustifyBlock', '-', 'BidiLtr', 'BidiRtl'] },
            { name: 'styles', items: ['Styles', 'Format', 'Font', 'FontSize'] }

        ];
};

view code

<div class="container text-right dirrtl"> <div class="row"> <div class="col-md-8"></div> </div> </div>

@section scripts{

<script src="//cdn.ckeditor.com/4.11.4/standard/ckeditor.js"></script> <script> CKEDITOR.replace('description', { customConfig: '/js/Config.js' }); </script>

}