WooCommerce Uploads - Adjust Price Based on Total no of Uploads

add_action('woocommerce_before_calculate_totals', 'dndmfu_wc_calculate_totals', 20, 1 );

function dndmfu_wc_calculate_totals( $cart_object ) {

    if ( is_admin() && ! defined( 'DOING_AJAX' ) ) {
        return;
    }

    foreach ( $cart_object->get_cart() as $cart_item ) {

        // Get uploader name
        $file_upload = 'dnd-wc-file-upload';

        // Price
        $price = $cart_item['data']->get_price();

        // Count no. of files
        if( isset( $cart_item[ $file_upload ] ) ) {

            // Get total files
            $total_files = count( $cart_item[ $file_upload ] );

            // Multiple current price * total no of files
            if( $total_files > 1 ){
                $price = ( $price * $total_files );
            }

            // Set new price
            $cart_item['data']->set_price( $price );
        }

    }

}