Do Synology Plus-series NAS units require Synology-branded drives?

This is a real, repeatedly flagged issue. Community threads and the Plex forums note that Synology's newer Plus-series systems (including the DS425+ and DS1825+ generation) have tightened compatibility toward Synology-certified or first-party drives. Buyers cite this as a meaningful downside versus UGREEN, which reviewers say works with standard Seagate/WD drives.