currently you can't reupload a render for your own entries if there is already a render. i don't know if this is intended behaviour, but it would be nice if you could reupload a render on your own entries.

For current battles it allows you to, since it gives the option of uploading a new mp3 post resubmit (so you have to resubmit the original file first).

Or are you talking about instances where a battle has already finished?

The main reasoning for this is (iirc) to prevent botbrs who want to go dark on the web, trying to erase the fact they existed to the most extent that they can. If a botbr who was trying to scrub the Internet of their presence could reupload entries, it would allow them to reupload an MP3 of silence or white noise that lasts 20 minutes if they wanted. I don't know about you, but I wouldn't like it if a 20 minute song of nothing was queued up in BotB radio.