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Open Library or the You / Subs tab and choose Sign in. Follow the Google / Supabase auth flow in the app. Some YouTube features need an extra read-only YouTube permission — grant it when prompted, or switch accounts and sign in again.

Sync runs after you sign in. Check your network, pull to refresh Library, and confirm you’re on the same account you used before. Guest data stays on-device until you sign in.

Open Settings in the app. Night mode and Language are under Appearance. Language options include system default plus several locales (for example English, 简体中文, Português Brasil).

When signed in, open the account menu from Library and choose Delete account. This removes account-linked library data from our backend according to the Privacy Policy. Uninstalling alone does not always delete cloud data — use Delete account when offered.

Upstream stream formats change often. Try Retry, another network, or update the app. Some videos may be region- or age-restricted and cannot play in YTLite.