Global Replace Feature for Images
The Global Replace feature was created for times when you want to replace an image that is being used in multiple designs all at once, without having to go in and edit each design individually.
To do this, find the thumbnail of the image you want to replace in your My Images area. Right-click on the thumbnail image and then select Globally Replace Image:
A window will appear and allow you to select and upload the image that you want to use instead:
This will replace that image both in your My Images area and in all of the designs that are currently using that image. Please note that if the existing image is a different size than the one being used to replace it, some adjustment may be necessary to have it fit the same way in your designs.