The CloudHealth Webhook integration does not support sending attachments.
For more information on Webhook documentation, see: https://techdocs.broadcom.com/us/en/ca-enterprise-software/it-operations-management/cloudhealth/saas/index/using-and-managing-tanzu-cloudhealth-using-and-managing-index/using-and-managing-tanzu-cloudhealth-integrating-with-third-party-services.html