Adding attachments to a mail

Problem/Motivation

We discovered that the module did not provide any ability for attachments

Steps to reproduce

we added this code to src/Plugin/Mail/AzureMailer.php

foreach ($message['params']['attachments'] as $attachement) {
        $fileContent = base64_encode($attachement['filecontent']);
        $attachments[] = [
            "name" => $attachement['filename'],
            "contentType" => $attachement['filemime'],
            "contentInBase64" => $fileContent
        ];
    }

    $azureMessage = [
      'recipients' => [
        'to' => [
          [
            'address' => $message['to'],
          ],
        ],
      ],
      'senderAddress' => $message['from'],
      'headers' => $message['headers'],
      'replyTo' => [
        [
          'address' => $message['reply-to'] ?? $message['from'],
        ],
      ],
      "attachments" => $attachments,
    ];

We are able to send mails with attachments.

Proposed resolution

Is that something you guys could be implementing?

Remaining tasks

User interface changes

API changes

Data model changes