In ForeUI, all images displayed in editing area are actually image references, which link to the images managed by the images panel. One image can have multiple references. If an image is changed, all its references will be updated as well.
Images panel is a place to manage all images that used in the plot. The images panel is docked on the left of the main window by default.
Here is an example. There is an image (img0) in the Image dock. The button reference the image with "[img0]" prefix in the text content.