Adding New Contacts to the Existing Campaign

Requesting For Essential Feature add-

When I am searching new contacts and would like to add those contacts to the existing campaign unable to add new contacts to the existing campaign.

To provide an example, let's say I have a campaign running with 100 contacts. Now, I want to search for an additional 100 contacts on LinkedIn and add them to the ongoing campaign.

I would greatly appreciate any assistance in resolving this matter.

Thanks!