How can I send a video message in a conversation on my mobile device?

On mobile:

In the conversation list:

1. Tap the name of the conversation where you'd like to share a video.
2. Tap Shutter .
3. Tap Camera Switch  to change from front to back camera.
4. Record a video.
5. (iOS) Tap Play  to preview the video, Retake to take another video, or Use Video to share the video in the conversation.
6. (Android) After recording, preview and confirm your video or retake the video.
7. Tap Check  to share the video in the conversation.