Add custom fees based on extension (WooCommerce - File Upload)

add_action('woocommerce_cart_calculate_fees', 'codedropz_upload_fees');

function codedropz_upload_fees(){

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

    //@note: Define  your raster file extension here
    $raster_ext = 'jpg|jpeg|png|tiff';

    //@note: Add your custom label for the fee
    $label = 'Additional Fee';

    //@note: list of product id
    $apply_to = array(4907,4661,4452);

    //@note: Replace with your desired percentage
    $percentage = 10;

    $products = WC()->cart->get_cart_contents();
    $total_fee = 0;

    foreach( $products as $index => $product ) {
        if( isset( $product['dnd-wc-file-upload'] ) && count( $product['dnd-wc-file-upload'] ) > 0 ) {
            $raster_extension = explode( '|', $raster_ext );
            $_product = $product['data'];
            foreach( $product['dnd-wc-file-upload'] as $index => $file ){
                $price = ( $_product->is_on_sale() ? $_product->get_sale_price() : $_product->get_regular_price() );
                $file_type = wp_check_filetype( $file );
                if( in_array( $file_type['ext'], $raster_extension ) && in_array( $product['product_id'], $apply_to ) ){
                    $total_fee += ( $percentage / 100 ) * $price;
                }

            }
        }
    }

    if( $total_fee > 0 ){
        WC()->cart->add_fee( $label, $total_fee, false, '');
    }
}