How to fix errors such as "Invalid media size" and "Invalid media URL"?

We recommend passing the content length in the send message API call header for an outbound message with media files hosted on your server(CDN). The Content-Length header indicates the size of the message body, in bytes.

To avoid such errors, we recommend you keep your CDN server that hosts the media files up and running to ensure we do not get a timeout when we make the head request.