"480p upscaled" files or small 300MB episodes—these are usually just original DVDs blown up, not true remasters.
(ATLA) does not have a native 1080p source. However, the show has been remastered and upscaled for high-definition platforms. Technical Overview of the 1080p Remaster The original series was produced in Standard Definition (480p) 4:3 aspect ratio atla remastered in 1080p link
To get the true 1080p experience without compromising your device's security with "free" pirate sites, here are the most reliable sources: 1. The Official Blu-ray Collection (The Best Quality) "480p upscaled" files or small 300MB episodes—these are