No image or Logo in pdf quote

This code return the images of logo and thumbnails path instead of URL that isn't supported by some server. 

Paste this code in functions.php of your theme:

if( defined('YITH_YWRAQ_PREMIUM') ){
    add_filter( 'ywraq_pdf_logo', 'ywraq_change_pdf_logo' );
    function ywraq_change_pdf_logo( $logo ) {
        $logo_id = get_option( 'ywraq_pdf_logo-yith-attachment-id' );
        $logo = get_attached_file( $logo_id );
        return $logo;
    }
    add_filter( 'ywraq_pdf_product_thumbnail', 'ywraq_change_pdf_product_thumbnail', 10 , 2 );
    function ywraq_change_pdf_product_thumbnail( $url, $id ){
        if( $id ){
            $url = get_attached_file( $id );
        }
        return $url;
    }

}