echo FileUploadUI::widget([
            'model' => new Model,
            'attribute' => 'doc',
            'url' => ['site/upload'],
            'gallery' => false,
            'fieldOptions' => [
                'accept' => '*'
            ],
            'clientOptions' => [
                'maxFileSize' => 100000000,
                'maxChunkSize' => 10000000, // 10 MB
            ],