Looking for documentation of public API for - Jira Zephyr Squad > Test Case > Attachment

I’m working on integrating Jira Zephyr Squad with another tool and need to attach files to Zephyr Squad Test Cases via API. However, I couldn't find any public API documentation that supports this functionality. My requirements:

• A REST API endpoint that allows attaching files to a Zephyr Squad Test Case.
• The required request format (headers, body, authentication, etc.).
• If no direct API is available, are there any workarounds or alternative approaches to achieve this?

Please help, Thanks in advance.

-JB AJD /11March