How to create a video for a map?

That’s exactly what I’m saying: if you create a mod using the editor (Resource -> New MOD) and pack the dialogues (and other things) into it, then the archive with the mod will contain a file called index.bin, which makes the newly created objects visible in the editor (as you can see in the screenshot – these are custom dialogues). If you delete index.bin from data.pak and a2p1-data.pak, then even the developers’ objects will not be visible in the editor.