Artwork for TV Shows

I'm trying to change the posters for artwork for TV shows and for the life of me I cannot figure it out. I have followed the override artwork and metadata instructions from the Infuse website forums and it has not worked no matter what. I have successfully done it with multiple movies and videos that are categorized as Other but it WILL NOT CHANGE FOR TV SHOWS. Any advice? I am on MacOS and my library is directly from my hard drive, no streaming or online files involved