While off of school wifi, the "Camera" app does not allow you to save your pictures. This is because the camera app automatically wants to save the pictures to the network, which is not accessible off of school wifi.
Solution:
Search online webcam on google, click any site, and allow webcam access. Take your pictures, then save to the computer.
Alternate Solution:
Take the pictures using your phone. Upload these images to your school google drive using the phone app. Then on the surface, log into your drive and download the images to your computer by right clicking on the file you would like to save.