This is basically 2 issues in 1.
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Infuse will sometimes load low-res fanart. The shows have a 1080p/4K backdrops in TMDB, but Infuse will display a highly compressed version (no higher than 720p). This only happens with a few shows. My best example is South Park, because of point #2…
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For maybe 10% of my shows with custom artwork, Infuse will refuse to load my posters and fanart. I have custom artwork for maybe 20-ish tv series, and most work fine. I have fully dumped my metadata and allowed Infuse to re-sync the entire library multiple times. For me, South Park will initially load my custom artwork… the poster and fanart will display, and it will remain like that for about one day before reverting back to a low-res version of the artwork that’s in TMBD. Some of my other shows (eg RuPaul’s Drag Race UK) will act like I don’t have custom artwork at all and will literally never display them… TMDB art is loaded instantly and just remains forever.
My media is organized in this manner:
TV Shows/TV Show/Season 01/TV.Show.S01E01
I place the fanart.jpeg and poster.jpeg in the /TV Show/ directory (which again, works fine for most of my shows)
This occurs on all my devices (All three of my latest-gen Apple TVs, iPad Pro, and iPhone 15 Pro).