As @givemeacrown said, listing videos don't have sound. A workaround might be to provide a link in your description that directs potential buyers to an audio file.
@JulesTreasureCorner ^^ this. If you have social media for your shop, put a link (non-clickable) in the description directing buyers to that page where you can upload the video with audio.
I am tiring of poor communication from Etsy. I too wasted time establishing a video for use in my shop, in response to urging from Etsy. My video is an instructional video & needs the sound. Ughh. Hours of my time wasted, again.
@BespokeBinders: I suspect that Etsy's thinking is that the video should highlight the product and since they are a multi-lingual platform audio is superfluous; plus how much instruction can you provide in 15 seconds.
I really don't understand why Etsy refuses to allow sound. Perhaps because it is more difficult to control what they are hosting?? Or maybe because it takes up more server space??
Likely because lots of people may have music in the background of it that they have no lisencing for to be included in what would be considered a marketing video.
