I also ran into connectivity problems using the Google charts api for QR code creation and instead now use this php library hosted on my own web server and it works great:

GitHub - kazuhikoarase/qrcode-generator: QR Code Generator implementation in JavaScript, Java and more. https://github.com/kazuhikoarase/qrcode-generator

You can download the single 'qrcode.php' file from there and upload it to your own web server, and then in your own php script (e.g. 'qr.php', which you would also upload to your web server) you could just have something like:

<?php

$code = $_GET['qr'];

require_once("qrcode.php");

$qr = QRCode::getMinimumQRCode($code, QR_ERROR_CORRECT_LEVEL_M);

$im = $qr->createImage(12, 0);

header("Content-type: image/png");

header('Content-Disposition: inline; filename="' . $code . '.png"');

imagepng($im);

imagedestroy($im);

?>

So then, using the Insert from URL script step in FileMaker you can specify URL as something like:

https://yourserver.com/qr.php?qr=123xyz https://yourserver.com/qr.php?qr=123xyz

...and specify the Target as a container field, and you will end up with a PNG of the QR code representation of '123xyz', and also named as '123xyz.png'.