Which feature in Google Analytics allows you to upload a CSV file to join with Analytics data?

The feature in Google Analytics that enables users to upload a CSV file to join with Analytics data is known as Data Import. This functionality allows you to enhance your existing Analytics data by bringing in additional data points from external sources, such as user data or product information stored in a CSV format. By utilizing Data Import, businesses can perform more detailed analyses and gain deeper insights into user behavior, helping them to understand their audience and improve marketing strategies effectively.

Other options, such as Data export, refer to the ability to extract data from Analytics for use outside of the platform, which does not involve uploading additional data into Google Analytics. Data upload and Data stream do not accurately describe the capability needed to import external datasets and blend them with native Analytics data, making Data Import the correct choice for this functionality.