As you know, in Expandi you can create a Connector Campaign using various search options. It is also possible to upload a CSV file without the need to have a LinkedIn URL of the particular person. All you need is an email address.
Remember that this must be the email address they use on LinkedIn (primary or secondary).
Go to Expandi.
Go to Campaigns tab -> Import Connector Campaign
Create your message sequence as you would create in a typical Connector Campaign.
Keep in mind that you are not allowed to send a connector message in this type of campaign since the invites have already been sent out.
3. Import the CSV with all the email addresses.
Map the field: email.
Once your CSV is processed, you will see all the prospects in your Expandi campaign.
The limit for this campaign varies from 100 to 250 contacted prospects per day.
That's how to feature works from LinkedIn's perspective:
LinkedIn: My Network -> Contacts.
Manage synced contacts - Remove all.
Add more contacts.
Upload a CSV with all the emails of the prospects you have.
When LinkedIn finds them, they will populate on your screen. Once you mark them, you will be able to send them a connection request.