Add A Size to the List
Code
Filename: gpml-add-a-size-to-the-list.php
<?php
/**
* Gravity Perks // Media Library // Add A Size to the List
* https://gravitywiz.com/documentation/gravity-forms-media-library/
*/
add_filter( 'gpml_merge_tag_image_sizes', function( $sizes ) {
$sizes[] = 'image_one';
} );