How to create a video for a map?

I know a method: in the map properties, I select StartScene and enter the path to the video I need. Then, I click on the '...' button there. The scene appears in the tree. Now, I can edit it directly there, or I can close the window, right-click on the frame in the 'DialogScene' window, and select Refresh Tables. The missing scene appears in the window. It's not that complicated :)

Added 1 minute later
If needed, I can post screenshots.