Yes, you can attached a video (up to 25mb) within a convo. You can also attach audio. Here’s how to add a video within a convo.
Click the black + on the left side of your Convos editor.
A variety of options will pop up, including Carousel, Image, Audio, and Video. Tap “Video.” Then select the video of your choice.
3. The selected video will appear within the convo. You can always delete this video by clicking the garbage can directly above the video.