Most OTT apps have a “Download” section. Download a movie on Wi-Fi at 360p, and it will be 300-400MB – exactly what “portable” means, but legally and safely.
The "300MB" and "portable" tags indicate that the files are optimized for mobile devices or users with limited data/storage, using high-compression formats like HEVC. https bolly4uorg category southhindidubbed300mb portable