allergy to Russian characters

There simply cannot be Russian names in the editor. This does not apply to the text itself.

I still don't understand the phrase "insert videos into the map"... does this mean you create the map and the videos separately? Usually, inserting a video means specifying its playback in a script, which naturally does not affect the files.

Old videos can be returned to the editor, and I think I described this somewhere before. In general, it's quite simple. Go to (I don't remember exactly, maybe someone will correct me) Editor -> HOMMV, where the unpacked archives are located. Find the folder there that is named after your map, then DialodScene. Look for the folder with the video there (it is named the same as you named the video in the editor). Cut it out and paste it into another location. Open the editor, create a new video, and name it the same. Save it.

Next, it's a bit more complicated... the video folder appears again in the editor, but there are fewer files in it. Copy all the contents of the old folder and paste it into the new one. Click save and go back to the map. Copy again and paste again, and go back to the video. Usually, it appears. If not, go back to the map, repeat the file replacement operation, BUT this time SAVE and go back to the video again.