Summary

Adding attachments to Jira issue via REST API endpoint https://developer.atlassian.com/cloud/jira/platform/rest/v3/api-group-issue-attachments/#api-rest-api-3-issue-issueidorkey-attachments-post

Diagnosis

When adding attachments via REST API endpoint to Jira issue if the payload or body isn't formatted well, 415 error is thrown

Solution

Option 1: Using Command Line:

curl --location --request POST 'https://your-domain.atlassian.net/rest/api/3/issue/TEST-123/attachments'
 -u 'email@example.com:<api_token>'
 -H 'X-Atlassian-Token: no-check'
 --form 'file=@"myfile.txt"'

Option 2: Using GUI-based Tools (Postman)

This can also be achieved using any GUI tools of your preference. Here an example on how to perform the same operation using POSTMAN tool.

• Make sure to include "Content-Type", "X-Atlassian-Token" under "Headers" section with values shared.
• Make sure to include key named "file" and of type "File" to select the one from system, or "Text" to access files using absolute path/reference under "Body" section.
• Attaching the screenshots for reference:
   

NOTES:

• Bear in mind the permission limitations that might be associated with the file based on it's location of the local machine.