How to download file attachments from Forms via REST API?

[pablo medicina]

The endpoint GET /jira/forms/cloud/{cloudId}/issue/{issueKey}/form/{formId}/attachment returns only metadata (fileId, fileName, fileSize, mimeType), but there is no documented endpoint to download the actual binary file.

I have reviewed the official documentation:
- https://developer.atlassian.com/cloud/forms/rest/api-group-forms-on-issue/
- https://developer.atlassian.com/cloud/forms/rest/intro/

Questions:
1. What is the correct API endpoint to download form attachments using the fileId?
2. Is this functionality available via REST API?
3. If not documented, what is the recommended approach?

Thank you!