Updating new contact list in the published journey -

Step1 - Go to the Journey section (left panel) and click on ‘Start Journey’ for the journey where you want to add new contacts.

Step 2 - Select Upload Contacts as shown below to upload a new CSV file.

Step 3. Click on Next and map the personalization parameter in the next window as shown below

Step 4 - Click on Start Journey to send the journey campaign to the new contacts.