Almost every time one of my friends or I upload an .ogg file, it gets rejected with the reason “Unable to play file.” However, you’re able to play it in VLC without any problems. The video in the following tweet sums it up perfectly:
https://twitter.com/Vyriss_/status/796986944907407361
As can be seen in the video, the files were rejected for not being playable, yet you can still play them in Studio if you’re the owner.