How to install the add-in locally varies based on the client app — for OWA vs. Mac Outlook vs. Windows Outlook.
See this page for desktop instructions (you’ll want to “add from a file”).
See this page for doing this in OWA.
For testing users — make sure they remove the local add-in when you do go live in prod and make the server-side one live for everyone.
Client-Side Litify Inbox Installation for Testing
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