Attaches a file to an issue in JIRA.
- ID or Key (text): The ID or key of the issue you wish to upload the attachment to. You can use ‘Search Issues’ or find the key in the URL of the issue (https://yourdomain.atlassian.net/browse/**AT-19**).
- File Content (file): The file that will be uploaded.
- Attachment ID (text): The ID of the attachment.