copyObject silently failing

[dustinwilson]

I am trying to copy a list of ~50 files from one bucket on one region to a bucket on the region I'm using, and I'm running into issues where random large-ish files (~270MB) are failing to copy. Sometimes they will copy, but most times they won't. I get no errors.

// ...

// $config is data imported from a yaml file
$cred = $config['credentials'];
$bucket = $cred['bucket'];
$destination = 'my-bucket';

$s3 = new S3Client([
    'accessKeyId' => $cred['access_key_id'],
    'accessKeySecret' => $cred['access_key_secret'],
    'region' => $config['local_region']
]);
$extS3 = new S3Client([
    'accessKeyId' => $cred['access_key_id'],
    'accessKeySecret' => $cred['access_key_secret'],
    'region' => $cred['region'] ?? $config['local_region']
]);

$result = $extS3->listObjectsV2([
    'Bucket' => $bucket
]);
$generator = $result->getIterator();

foreach ($generator as $g) {
    $key = $g->getKey();
    
    $s3->copyObject([
        'Key' => $key,
        'Bucket' => $destination,
        'CopySource' => "$bucket/$key",
        'region' => $config['local_region']
    ]);
}

For most files this works just fine, but occasionally it just silently fails to transfer files. If I use Amazon's official API it works just fine, but I'd rather use this one if I can. I've tried using ->resolve() with a high timeout, but it doesn't seem to make any difference. Is there something else I should be doing?