# Advanced Features

These documents explain platform-level behavior beyond the basic browse and transfer flows.

## Primary References

- [Omni Experience](../OMNI_EXPERIENCE.md).
- [Transfer Quotas](../TRANSFER_QUOTAS.md).
- [Billing UI](../BILLING_UI.md).
- [Privacy Architecture](../PRIVACY_ARCHITECTURE.md).

## Topics

- Cross-device state and shared persistence.
- Plan visibility, quota accounting, and billing UX.
- Operational transparency for Fly.io worker access.
- Product areas that intentionally surface provider-side constraints.

## Related Guides

- [Search Features](./SEARCH_FEATURES.md).
- [Backup and Sync](./BACKUP_SYNC.md).