Current questions and answers regarding the map editor.

Thank you, everything is correct.
And here's another question - we have a map, but when selecting a Castle in it, you can't choose a hero (that is, you can select a Castle, but you can't select a starting hero).
I checked in the editor, everything is fine, inside the map archive - it's Multiplayer, not single-player.
How can I fix this?

Exactly. Something like this, but the problem is that you can't choose who is AI and who is a player. It also says it's Multiplayer, not single-player.

Added 1 hour 1 minute ago
And I have 2 more questions, please excuse me, I guess I don't understand the basics. I can't create my own camera. The map is in FXtest (not my map). At first, I had a black screen, as I wrote above. Then I created a T camera (I also described how I did it above), added it to the replica, and in the replica, I did the following:
Hero Royal Griffons
C. montsere name --
Text: Rrrrrr
Camera 3 (for some reason, when I exit and then re-enter the editor, the cameras I created disappear)
Sound .../Town/Inferno/Town...
Add --
Cancel amb. sound yes (checked)
Cancel Music no
Custom amb. light Haven Light 2 (Grass)
Pause after actor's 1
Animation unavailable (grayed out, cannot be clicked) Animation Start unavailable (grayed out, cannot be clicked)
, I turn on the video display, and my their camera is restored, in another, not specified by me, completely unnecessary place.
And the second problem, as you probably already understand (that I create a video on a map that is not mine), is how to choose/create my own map for the video. In Dialog Scenes, I create a new folder, in it I create a new object, and then... the question is, what next. If you click ..., there are no maps of mine there, I was looking (for some reason, besides one single map that I generated, I made a random map only once, and it is in the list). And if you click New, I don't understand what to do there, except for 2 items, where you choose the lighting, well, and the first one, although it's not clear why you need to choose the map size (because if you create a map for a video, you can still only put everything from the panel on the right, Object). Please tell me how to use New.
Thank you in advance to whoever answers!