Does your image look a little skewed or imperfect when you look at your Mobile preview? No worries! You can add alternative images to your mailings to help improve mobile rendering.
In Mailing Designer, add a story that contains an image.
Check the Use alternative image for mobile checkbox. This opens an additional image upload menu.
Click choose another image next to the mobile image preview to upload your alternate image.
One More Note
If you select an alternative mobile image, uncheck the checkbox, and then recheck the checkbox, Informz remembers the last image that it had selected if you continue to work in the layout. However, if you then navigate away from the layout, Informz does not remember the image that was selected last. Instead, it loads the original image.