YouTube Premium downloads offer offline viewing, not transferable files
Engadget reports that YouTube Premium supports downloads on mobile and desktop, but limits playback to the platform and removes access when a subscription ends.

YouTube Premium remains the platform’s principal route to offline viewing, according to Engadget, but its download function does not create a transferable video file. Content is stored for playback within YouTube on mobile or desktop.
The feature is designed for personal offline viewing rather than editing, sharing or moving videos between devices. Downloads made on one device are not automatically synchronised to another, even when the same account is used.
Engadget reports that downloaded videos remain available offline for 29 days before the device must reconnect to the internet. Access is also lost when the Premium subscription ends.
Premium Lite may allow downloads for almost all videos, although the source says Shorts and music content are excluded. Availability and conditions may vary by market, plan or YouTube policy.
Third-party download services can provide files, but may expose users to adware or spyware and may breach YouTube’s platform rules. YouTube’s Terms of Service prohibit unauthorised downloading and screen recording, subject to rights-holder permission, applicable law and lawful exceptions.

