When editing a page that includes images, I'm expecting the Add New function should open the Media Gallery to allow the user to select an image from the gallery, upload a new image, or add an image from a URL; which is the behavior on the Add Post Form.
Instead, the behavior is that the Add New button only allows the user to upload a new image.
I can't allow access to our site, as it is proprietary. I've attached screenshots to demonstrate the process. There is no custom CSS or JS on this page.
Operator Error
Somehow the Other Settings option for "Use the WordPress Media Library manager." became unchecked changing the expected behavior.