You can add collaborators from the project's "access permissions" screen, simply @message them in a comment, or invite them from the Users page in settings.

In settings:

Inviting somebody from a project's access permissions window.

If you'd like to collaborate with another user who has a Reduct seat and is a member of your workspace, simply @mention them in a highlight's comment. If they aren't already in your workspace or your project, they'll be added automatically.

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