All new contacts added into Drift, from the moment you connect the integration and forward, will be synced in to HubSpot's database as soon as they provide their email.

If you have contacts in HubSpot, those contacts will be recognized by Drift as well using HubSpot's cookie!

When a conversation is closed in Drift, we sync attributes for the contact.

Also log the Drift conversation link as an event on the HubSpot record.

To reiterate, Drift creates records in HubSpot upon email capture and then updates them with any data gathered in the conversation when the conversation is closed in Drift.