Has anyone created a Chatto PDF Message type?

I am developing an iOS healthcare related messaging app that, so far, has text and photo message types. I would like to add support for PDF (and/or other file kinds) message types.

The App is built using Chatto and Chatto Additions.

I have implemented 1-on-1 and Group Messaging with Text and Photo message types. The App also utilizes end-to-end encryption via Virgil Security's E3Kit.

I would like to be able to send and receive messages that contain PDF files. It would be great if other kinds of files could be exchanged as well.

I am looking for an implementation that can be adapted for my App.

Start by reviewing Chatto and Chatto Additions' existing text and photo message types and their Swift extension points. Define the supported file-message behavior and verify sending and receiving with the app's end-to-end encryption; the issue names no files or tests, so the implementation scope needs clarification.

Written by the indexing model from the issue text.