It was ordered or unordered ?
Please make sure you have inserted the data into the video database of your sandbox cluster. You should be able to see the two documents that got inserted in your database from Compass as well.
In any collection you can’t have two documents with the same value for the _id field. In this case, when you ran the command for the first time, the data got inserted and when you ran the same command again, you got a duplicate error because the data was already there.
Hope it helps!
If you have any other issue, please feel free to get back to us.
Curriculum Support Engineer