To see insights for a video you posted:
Tap

or your profile picture in the bottom right to go to your profile.
- Tap
below your bio, then tap the video you want to see insights for. - Tap
(iPhone) or
(Android) at the top of the video. - Tap View Insights.
Now, you'll be able to see how many likes, comments, saves, and shares your video got. You'll also see other Engagement and Post Interactions metrics, such as Accounts Reached, view count, average percent of video watched, and an audience retention graph.
Note: Only you can see the average percent watched by viewers and the audience retention line graph. However, likes, comments and view count are visible to people who watch your video, just like they are in Feed.