Thank you for your continued feedback. As many people have pointed out, this is available on mobile today. Support for replying to a specific message is on the backlog for desktop. I’ll let you know when we have progress to share. Thanks.
Thanks for the comments and votes. This item remains on the team backlog and we will watch your votes and comments on this feature.
Great news! We just started working on this for the AUDIO portion. We are still trying to determine feasibility for the video portion of your request.