Issue with podcasting plugin

I'm having trouble with a podcasting plugin I use on my site that I just migrated from WPEngine.
According to their docs, nginx servers need some directives written in order to work properly. I can't see any way to do that myself, so I'm guessing I need you to do it?

The rules are documented at https://support.castos.com/article/59-podcast-media-will-not-play-anywhere.