How to move content from a section on one page to another page?

If you have an image element and have used the purple + icon to add markers over the image element, you can Copy and Paste the element into an empty placeholder and the markers will be preserved.

To copy the element, select it then in the upper left of the interface select Edit >> Copy.

You can now select the empty placeholder where you want to have the image, then in the upper left of the interface select Edit >> Paste.

If you want the image added to an Accordion Menu, you'll need to have the empty placeholder holder added to a panel of the Accordion.