Hi! Recently, AO3 took down one of my FIAB works from last year, told me that sheet music arrangement is not allowed on the site, and gave me an account warning. Sorry to bring bad news, but apparently "Medium Opt-In: Unique Rules - Sheet Music - Arrangement of Music From Canon" is out, according to what I was told. If there is anyone from previous years who had a work similar to mine, they might want to take it down to avoid a warning :(

I'm def not an expert but there might be more medium tags that are not allowed from AO3's perspective, especially ones related to music/audio/video. Like I'd guess that "Medium Opt-In: Audio - Arrangement/Cover Music" has the same issue. Argh.