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HOW-TO SEE WHO A REPORT IS SHARED WITH

Finding Out Who A Report Is Shared With 

You can find out who a report has been shared with by adding a column to a new or existing view, or on a report.

 

You can view the steps on how to create or customize a view here:
Creating and Customizing Views

Once in a Column Preview section, you can add the following column:
Report >> Shared With

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Once you open a view with this column, or run a report with this column, you will be given a list of all users and teams that are shared on each report.