Unable to upload attatchments over the Jira API - perl

Question

I've seen the question asked a few times but no real answer. The Jira::Rest module appears to be out of date since username and password is not an accepted authentication method.
I am unable to add attachments via perl. My first attempt was using REST::Client with LWP::useragent. Example below
my $client = REST::Client->new();
$client->addHeader('Authorization', 'Basic ' . $config_yaml->{auth}
$client->addHeader('Content-Type', 'application/json');
$client->addHeader('X_Atlassian_Token', 'no-check');
$client->addHeader('Content' => [ file => [ $filename ], ]);
my $file_sent = $client->POST("issue/$ticket/attachments");
my $response = $file_sent->responseContent();
For some reason the response was an empty string.
I thought maybe I was missing something so I tried with a curl request
curl --request POST --url 'https://cloudurl.atlassian.net/rest/api/3/issue/[ticket_id]/attachments' \
--header 'Accept: application/json' --header "X-Atlassian-Token: no-check" \
--header 'Authorization: Basic [api auth string]' \
-F "file=#test_file_upload.txt"
The curl request returned the expected message and the ticket had the attachment. So I tried again using just LWP::UserAgent.
my $ua = LWP::UserAgent->new;
$ua->timeout(10);
$ua->env_proxy;
$ua->default_header('Accept' => 'application/json');
$ua->default_header('X-Atlassian-Token' => 'no-check');
$ua->default_header('Authorization' => 'Basic ' . $config_yaml->{auth});
my $response = $ua->post($url, Content_Type => 'multipart/form-data',
Content => [
field => [$filename],
],
);
warn $response->is_success;
warn $response->decoded_content;
For some reason this returned 200 and an empty just like when I tried with Rest::Client. I believe the URL and parts of it are correct.
If X-Atlassian-Token is ommitted I get the error specified in the documentation and if I send no content I get an error complaining about that missing. Is there something missing from my request when I make it via LWP::UserAgent or REST::Client that causes me to get no response?
For reference this is the part of the api documentation I have been trying to work from.
https://developer.atlassian.com/cloud/jira/platform/rest/v3/api-group-issue-attachments/#api-rest-api-3-issue-issueidorkey-attachments-post
The parts discussed on the atlassian support area do not seem to have a solution for this either.

Answer 1

If you have root access on the box, I'd use tcpdump -A -s2048 host cloudurl.atlassian.net and look for any differences between the successful curl and the other messages.
https://www.perlmonks.org/bare/?node_id=464442 suggests using
print $response->headers_as_string;
or
print join "\n", $file_sent->->responseHeader($_) for $file_sent->->responseHeaders();
to see what you're getting back.