How to create a video for a map?

Well, I started figuring it out, and a question immediately arose. How do I choose my map as a backdrop if the list only contains some random stuff?

Manually enter the path to it.
In my opinion, dialogues where the backdrop is just a regular map don't look very good.

Added after 14 minutes
Heroist, it's still better to create cameras using E and T. You don't have to struggle with their parameters, and the result is better.