Please note: By default Google will attempt to automatically backup we have separate instructions for turning off automatic backup on iOS and Android.
When you open Google Photos please swap to your School account using the account switcher in the top left (you should see the avatar for your personal Google account.
From the menu that appears click on the arrow next to your account and select your School account.
There is also an option to add another account if you haven't logged in previously.
You can now select individual photos (see left image) or multiple (see right image). Then click on the 'Back-up' button.
Once uploaded the photos are available on your Chromebooks / online.
