Add New Email Threads to Unibox

Proposed Feature: By selecting an email address and copy pasting the email thread URL into the unibox new feature location, you can add conversations to show up in the unibox, even if they were not part of the campaigns.

I buy workspaces for my clients, because they want to come in and check the unibox and reply themselves to the most important leads. Unfortunately, they can be in the middle of getting a quote, then someone from their conversation starts a new email thread which will not show up in the unibox, and they will never see it unless they log in through all 10 of our email accounts.

This new feature would allow us to add any conversation which was not part of the campaign into the unibox, and allow the unibox to monitor the new email thread so that our clients can continue responding without having to navigate through multiple different emails and keep track of multiple emails all at once from different emails.