And one more thing – the video will not be saved until you officially create it within the map (go to the properties tree of the desired map and create a start scene there. Then, open the advanced editor mode, go back to the same map, find the dialog scene in the special window, and go to the video creation window. In other words, if you try to create a video/creature/spell – anything – without first going to any map, all changes will be deleted after you exit the editor. In that case, they will be saved, but will be linked to that map.
"And create backups more often."
Please go to the "Videos" topic a little further down in the section.
To change the scene, in the default window on the left of the video, where its parameters are located, in the very first line, there is something like "adv_map". By clicking on "...", you can select the map you need for the video from the list; the environment will change after "reloading the video".