What file types does Zendesk Talk support in MMS messages?
Talk provider, Twilio, accepts and transforms
.png image file types. When Twilio receives a file type matching one of these formats, they will handle the extension setting for those files.
Twilio doesn't provide the file extension setting for MPEG and MP4. Zendesk attaches the file received from Twilio, without modifying its format.
Zendesk does not support automated file formatting for any file type other than
.png files sent through Twilio.
For more information on Text, see the article: Using Text notifications with triggers: Recipes and tips.