Tuvis will automatically sync every text messages you exchange with customers over WhatsApp when the Auto-Sync button is turned on. It syncs every message you view on WhatsApp (web) up to 3 months back, and any new message you send/receive.
The sync is done every 60 seconds, whenever you switch between WhatsApp chats or when you close the WhatsApp browser tab. When you see the blue V sign added next to the message, it indicates that it was captured and will be included in the next batch sync.