The Insights Engine is one way that Sensor Tower exposes interesting events and context to our mobile ecosystem estimates. When you find new insights or important data, you can share those data with other members of your organization by publishing your own custom annotations to the Insights Timeline. 

To publish your own custom annotation, you can click on the green plus icon at the left edge of the Insights Timeline, or click on the last row of any Insight tooltip. 

On the Add Annotation modal, you can pick under which app and date you want to publish the annotation. 

If you want to Edit or Delete an annotation, just click on its icon on the Insights Timeline. Only the annotation author or an organization Admin can edit or delete an annotation.