How to send and read image/video in iOS message extension?

My goal:

Allow user to send (or attach) a video clip to a message
Allow receiver to read (not playing) the video when it is received
Not using an additional server to host these messages or videos. In other words, I want everything to be done within the message extension framework.

I tried:

1) Using MSMessage:

private func insertVideoIntoMessage(usingUrl url: URL) {
    if let conversation = self.activeConversation {
        let layout = MSMessageTemplateLayout()

        layout.caption = "Some caption"
        layout.mediaFileURL = url                // Media file (video)

        let message = MSMessage()
        message.layout = layout            
        message.url = URL(string: "some url")

        conversation.insert(message, completionHandler: { error in
            if let error = error {
                print("Error:", error)
            }
        })
    }
}

I would like to let the receiver read the media file (video). However, it doesn't seem to be possible.

override func didSelect(_ message: MSMessage, conversation: MSConversation) { 
    // message doesn't seem to contain any media content 
}

2) Using an attachment:

private func insertVideoInMessage(usingUrl url: URL) {
    if let conversation = self.activeConversation {
        conversation.insertAttachment(url, withAlternateFilename: "Some file name", completionHandler: { error in
            if let error = error {
                print("Error:", error)
            }
        })
}

This way the attachment (video) is opened by the system's default App. Which means my App couldn't read the video.

Questions:

Is it possible to let receiver read the video sent by sender?
Is it possible to insert an attachment AND insert an MSMessage at the same time?
Or is there any other way that I could do what I want?

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