Currently, you may encounter the media-download-error when sending WhatsApp messages with attachments via the API. This error occurs when WhatsApp is unable to download the attachment from your server.
We are investigating this issue with WhatsApp and working on a resolution.
We’ve added the authentication of callback requests sent from edna Pulse to your server. To enable it, select the checkbox in the Callback request authentication section in Integration → Settings and copy the API key.