The Walking With series is one of my favorites. Walking with Dinosaurs has stuff about the Triassic, Jurassic, and Cretaceous, but you’ll find yourself sucked in very quickly and want to watch all the Walking Withs like Walking with cavemen, walking with monsters (pre-dinosaur species), walking with prehistoric beasts, etc.
Triassic: Age of the Dinosaurs is a BBC documentary on YouTube for free that is pretty solid.
Other than that, since the popular dinosaurs all came from the Jurassic and Cretaceous periods, there’s not a whole ton about the Triassic. There’s a book on audible about it but I can’t speak to the content as I haven’t read it yet