Screenshots for an entire operation can be accessed via the "Operational Views" -> "Screenshots" page from the top navigational bar.
Screenshots are listed in tasking order.
To view a screenshot, simply select the eye icon to view the image in a new overlay. To download the image, click the download icon. If a screenshot is still downloading, you'll see the progress so far under the
Completed column. Since these are images, you can view them as they come in even if they're not finished being sent to the server yet (you'll just see a portion of the image).
Screenshots can also be viewed within the main active callbacks window as well. Select the dropdown for a callback and select "screenshots"
The same interaction method applies here as well - click the row and the screenshot will be displayed in-line.