You can update the images in a campaign by following these steps:
1. Open the Campaign Details page
2. Navigate to Editor
3. Click on the 'Images' tab and then click on the image icon
4. Hover on the image that you’d like to change and click Select
5. Once you upload the new image - click on Save Changes
6. If you need to upload the new image click the 'Upload new' button
7. In order to apply the new images to other campaigns - click on the 'Copy to other campaigns' button
8. Once you update the images, you can check all presets in the Campaign Preview
*Note: Different campaigns may have different image dimensions on the same page, so, before copying images, make sure that these campaigns are using the same sizes.