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I don't think child theme is the problem, because both plugins don't do anything specific for themes.

Do you see any errors in the log?

Unfortunately, it's not supported. The plugin uses only the default WordPress uploader. I think other plugins use different JavaScript API so they won't work together.

It's $100 to upgrade. Please purchase it via Paypal and I will refund the $99 of Core Ext. Bundle to you.

Looks like the problem with the select2 library. Do you see the problem if you load fewer entries (500 for example) and no limit on the displayed result? I tried searching and found only this result but it's not 100% the same issue.

Hi, the sizes value returned is not the sizes attribute in responsive image. It's an array of the following info:

[sizes] => Array
(
   [thumbnail] => Array
       (
           [file] => press_image-150x150.jpg
           [width] => 150
           [height] => 150
           [mime-type] => image/jpeg
       )
   [medium] => Array
       (
           [file] => press_image-4-300x194.jpg
           [width] => 300
           [height] => 194
           [mime-type] => image/jpeg
       )
   [large] => Array
       (
           [file] => press_image-1024x665.jpg
           [width] => 1024
           [height] => 665
           [mime-type] => image/jpeg
       )
   [post-thumbnail] => Array
       (
           [file] => press_image-624x405.jpg
           [width] => 624
           [height] => 405
           [mime-type] => image/jpeg
       )
)

To get the sizes attribute, we can use the following function:

wp_calculate_image_sizes( $size, $image_src = null, $image_meta = null, $attachment_id = 0 )

So, in your code, you can do like this:

foreach ( $images as $image ) {
    $sizes = wp_calculate_image_sizes( array( $image['width'], $image['height'] ), null, null, $image['ID'] );
    echo "\n<a href='{$image['full_url']}'>\n<img src='{$image['url']}' width='{$image['width']}' height='{$image['height']}' alt='{$image['alt']}' srcset='{$image['srcset']}' sizes='{$sizes}'>\n</a>";
}

Hi @jonwatson87,

I'm very happy to see you figured it out. The way you use the helper function is correct!

Hi @Maxell, can you please clarify the idea? I'm not sure what you're talking about.