It’s a wav file in Jellyfin. I have made sure the file in question has not been corrupted. I’ve also confirmed it’s not a Jellyfin issue as I’ve tested and confirmed that it works in chromium. Every other wav file (or otherwise) works perfectly fine. If it matters, I am using the Arkenfox user.js
Song name: Coming Up Milhouse by Dankmus
The comment ‘It’s a wav file in Jellyfin’ makes little sense.
There must exist a file, which is not contained by Jellyfin but instead exists in the filesystem. Is this the same file downloaded from the Youtube you mention?
Why not share the actual file, or actual youtube link?