Backend 

New media queries can be added to the backend dropdown inside the variation through the PageTS tree by adding entries to: TCEFORM.sys_file_reference.media_width

media_width 

Property
media_width
Data type
array
Description

List of media query widths

Example:

media_width.addItems {
    (min-width: 200px): Very small device image
    (min-width: 1600px): Very large screen
}
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