Twilio Assets is a static file hosting service that allows developers to quickly upload and serve the files needed to support their applications. With Twilio Assets you can host your files that support web, voice, and messaging applications. Twilio Assets is frequently used to host .mp3 audio files used in TwiML and Studio Flows, to serve images sent through MMS, or to store configuration used by Twilio Functions.

How Assets work

Twilio provides you with three different types of Assets: public, protected, and private. The primary difference between the types is how they are accessed:

• Public Assets are served over HTTPS from the Twilio CDN to ensure that they are highly available and secure, and are accessible by anyone with the Asset's URL.
• Protected Assets are accessible via the Twilio CDN by URL as well, but require a valid Twilio request signature, or they will return a 403 error.
• Private Assets are not accessible by URL or exposed to the web; instead, they are packaged with your Twilio Functions at build time.