You can gather insights data about downloads from portals, as well as collections embedded in portals, from reports you create in the Insights app. Exporting those gives you an even greater view into the details of the data.
To get a high-level overview of the number of views of a specific portal, you can see the number of times it’s been viewed for a certain date range in the Portals app. Specific views of assets are not listed in the Portals app.
Learn more about portal views in this article.