Collections don't have thumbnails

[TheDreadPirate]

Thanks everyone in here for helping me get Collections working with images both on the main page called Collections and inside on the actual box collections of my movies/series.
I followed the advice and went to GITHUB where I searched for TMDb Box Sets Plugin in Google which brought me to https://github.com/jellyfin/jellyfin-plugin-tmdbboxsets
I copied the build URL and pasted that into the -Catalogue-Settings-tap the + sign to add the info. I called the Repository name TMDB Box Sets and paste the URL I copied from Github into the Repository URL.
From here it was a bit muddy lol but I basically logged into my Portainer in Linux, found Jellyfin and restarted the service. Then in Jellyfin I refreshed the Meta Data for Collections and after a bit I noticed I had all the Images!
NICE!

FYI, the TMDB boxset plugin is in the official plugin repository that comes with Jellyfin.  There was no need to add another repository.