That's correct, videos do not play sound, you have to make the sound a separate wav or ogg file and put it in the audio slot of the story zone. It's been like that since DirectX 11 was implemented, microsoft were to cheap to include a VLC player inside DirectX 11 and now developers have to make their own, but that hasn't been done for gameguru yet, so as a workaroudn it's been set up so that if you put the audio in separately it will play them together.
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