WhatsApp Cloud API deletes messages and media after 30 days:
https://developers.facebook.com/docs/whatsapp/cloud-api/overview/data-privacy-and-security/
Does the Twilio Conversations API store the media separately from Twilio so that you can keep the media until you delete the messages within the Conversations API?
I cant find any documentation beyond requesting temporary urls for media!
Conversations messages are stored indefinitely until you delete them. This includes media messages.