Liferay Sync requires the Liferay CE Sync Connector app from Liferay Marketplace. This app enables and configures Sync in your Liferay DXP instance. For example, you can disable Sync across the instance or on a site-by-site basis. Note that Sync is enabled by default for all Sites.
For instructions on installing Marketplace apps, see the Liferay Marketplace documentation.
If you want to use Sync Connector’s default settings and are fine with Sync being enabled for all your Sites, you can skip the articles that follow on configuring Sync. However, before directing your users to install and configure the Sync desktop and mobile clients, make sure to read this guide’s articles on preventing accidental file deletion and ensuring Sync security. You should also warn your users about the potential for accidental data loss.