You can create folders to organize your collection of images.
While logged in as a teacher, go to your Studio tab, and then scroll down and click Images.
In the menu, you will see a blue button that says "New Folder" with a Plus symbol next to it; click this to create a new folder.
You can name the folder, and then it will appear in your folders list which you can access.
To add an image to a folder, click and drag the image to the folder you want the image to be in.
To remove an image from a folder, click on the Blue Minus Icon in the upper right corner of the image thumbnail.
You can Delete the Folder, Rename the Folder, or Add a New Subfolder as well while viewing it.
When viewing the contents of a folder, and you want to go back to the higher level folder, or home, click on the blue "↑Up" button, or the small "Home" icon.