Save it
3B (If you take three screenshots). Make it so that all three screenshots are in one image, using a photo editor.
Open the blueprints tab in SP
Open the screenshot as a blueprint
Open the share tab
When you do the screenshots, move the camera so that it shows the image
7B. (if you do three). Move the camera so that each thumbnail shows one of the three images.
3B (If you take three screenshots). Make it so that all three screenshots are in one image, using a photo editor.
7B. (if you do three). Move the camera so that each thumbnail shows one of the three images.