XMLTV - What kind of format does Plex expect (To get episode icon / poster)

Hi there.

Basically, i’m wondering what kind of format the XMLTV should be in, for Plex to actually be able to derive tv/movie information. Because right now it’s all empty when it comes to icons.

I know XMLTV has the … feature, but supplying the icon is a stopgap, is there some sort of etc. things we can supply with an ID so Plex can go and get the information/icons/younameit automatically?