How to Remove a Vocal Guide and Other Uploader Questions

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I've only been uploading songs for about a year now on Smule, so please forgive my ignorance on these issues.

I had uploaded a song last year and just noticed that there is now a vocal guide attached to it. I have no idea how to attach vocal guides to songs, so I'm not sure how this one is now there. Was another user able to upload it and attach it to the song? The problem is...it's not a really good vocal guide in my opinion, and it actually might explain the lower score the song has been getting in recent months. I'm currently trying to find a way to remove the vocal guide and would appreciate any help in doing this.

The other thing with this particular upload - I have no idea if this is related or not - but I'm unable to update the song in any way. Whenever I try, I get this Oops! message. So even if I figure out how to remove the vocal guide, I'm not sure it'll even let me.