aiopa

Your issue is not with this pluggin ??

File:
/wp-content/plugins/wp-pdf-templates/wp-pdf-templates.php

And remember to backup this file!!

So i solved my problem by using cURL, I added this

function curl_get_contents($url) {
    $ch = curl_init();

    curl_setopt($ch, CURLOPT_HEADER, 0);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_URL, $url);

    $data = curl_exec($ch);
    curl_close($ch);

    return $data;
}

And changed
$html = file_get_contents( $link, false, $context );

$html = file_get_contents( str_ireplace( 'https://', 'https://', $link ), false, $context );

$html = file_get_contents( $link , false, $context );

To
$html = curl_get_contents( $link );

$html = curl_get_contents( str_ireplace( 'https://', 'https://', $link ) );

$html = curl_get_contents( $link );

Found some more Errors:

/pdf
gives error:
Failed to load PDF document

/pdf-preview
gives error:

Warning: file_get_contents(https://localhost/produkt/twizy-leasing/?pdf-template): failed to open stream: HTTP request failed! HTTP/1.1 400 Bad Request in /var/www/xxx/dist/wp-content/plugins/wp-pdf-templates/wp-pdf-templates.php on line 243

Warning: file_get_contents(https://localhost/produkt/twizy-leasing/?pdf-template): failed to open stream: Connection timed out in /var/www/xxx/dist/wp-content/plugins/wp-pdf-templates/wp-pdf-templates.php on line 247

Warning: file_get_contents(https://xxx/produkt/twizy-leasing/?pdf-template): failed to open stream: Connection timed out in /var/www/xxx/dist/wp-content/plugins/wp-pdf-templates/wp-pdf-templates.php on line 254