Contacts are able to add attachments to messages. However, these attachments are not accessible via the message webhook/list messages api and cannot be sent via the send message api.
It is not feasible to request contacts always use the Files app for sending files (or look there to find files). And currently, a file can be added via API to files, but there is no way to show it in the chat.
List Messages / Send Message / message.sent Webhook should have an attachment data urls array to access the attachments.
This is necessary for compliance, logging, audit trail, sync of message content to other systems, and automatic sending of attachments (e.g. photos) into the chat.
Hi @Bill_Vieux Thank you for reaching out and for your feedback!
I completely understand how important this is for compliance, audit trail requirements, syncing message content to external systems, and supporting workflows where attachments need to be automatically surfaced in chat. I have shared this request with our product team.
To make sure we capture it accurately, the features you are asking for are the ability for:
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The List Messages API to return message attachments
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The Send Message API to support sending attachments
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The message.sent webhook to include attachment URLs or data
If there is anything else you would like us to include in the request, please let me know.Thank you again for taking the time to explain the scenario. Your feedback helps us improve! 
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