In the content editor, you'll only be able to change an existing image or upload new images to the image library.
Follow the steps below to learn how to do it.
Change an image
Hover over your image
Click on Change image
Select Change image (again) at the bottom
Choose an image from your project or from a stock image library
Upload an image to Vev
Hover over your image
Click on Change image
Select Change image (again) at the bottom
Click on Add image
Choose the image from your computer
The image will be available within the Project Images tab in the image library.