You can connect your CRM (Hubspot, Salesforce, and Pipedrive) to Instantly and import the leads to your campaigns or lists. In your CRM (Hubspot, Salesforce, and Pipedrive) you will need to create a List/Filter View with the leads that you want to import to Instantly.
First, add the CRM by connecting it in the Integration section. Here are the step-by-step instructions on connecting your CRM to Instantly:
Once connected, follow the steps from these articles to import your leads to Instantly from your CRM: