Link to a sample media file returned an invalid Content-Type

The link to the media file does not have a Content-Type header set to an accepted MIME type. As a result, the template was not created.

• The web server hosting the media file is not sending Content-Type headers
• The web server hosting the media file is sending an invalid Content-Type header

• Make sure the web server hosting the sample file returns either image/jpeg, image/png, application/pdf, or video/mp4 for the Content-Type header.