Session, Campaigns, & Channel Details
To navigate to your session lists, simply click Replay --> Sessions in your left navigation menu.
In this view you can see a list of all sessions to your website, along with details for Source/Medium, Campaign, Search Terms, Content, Operating System, Browser, and Country.
At the top of your session list you will see the total number of sessions displayed in this list. To see how many of a particular session type (See example for iOS filter below) have occurred on your website, simply apply a segment or filter, and the result will be shown in your total number of matches.