Stagger makes it easy to replace images in templates or existing designs. Our current release lets you drag your images from the media bar and onto the canvas or right click on an existing image.
To replace an image on the canvas, do the following:
Import/add any imagery you want to the canvas

Select an image and start to drag it to the image you'd like to replace
The destination image with highlight with a blue border and you'll temporarily see the image replace as a preview

When you're ready to have the image replace, release the thumbnail and the image will now be replaced.

To replace an image by right-clicking, do the following
Place your cursor over the image you want to replace
Right-click the image

Select "Change image"
The add media drawer will appear to choose an image