Thanks Jason for the sanitizing field data, I will check that.

Yes, the “newsletter” size is registered along with many other sizes that I already use in my posts. Maybe is some kind of scope problem?

<?php
    add_theme_support( 'post-thumbnails' );
    add_image_size( 'large-square', 400, 400, true );
    add_image_size( 'medium-fb', 600, 314, true );
    add_image_size( 'large-fb', 980, 513, true );
    add_image_size( 'grid-th', 500, 99999 );
    add_image_size( 'medium-longform', 728, 99999 );
	add_image_size( 'newsletter', 600, 99999 );

    add_filter('image_size_names_choose', 'my_image_sizes');
    function my_image_sizes($sizes) {
    $addsizes = array(
        "medium-longform" => __( "Medium Longform"),
        "large-square" => __( "Large Square"),
        "medium-fb" => __( "Medium FB"),
        "large-fb" => __( "Large FB"),
        "grid-th" => __( "Grid Thumbnail"),
        "newsletter" => __( "Newsletter"),
 );
    $newsizes = array_merge($sizes, $addsizes);
    return $newsizes;
    }
?>

I’m using this upload field inside a group with a repeater. That group is inside a Workflow tab and belongs to a custom post type.

Here’s the code for TAB-1 of the workflow

<?php

/*
Title: Add Content
Order: 10
Flow: Add Newsletter
Default: true
meta_box: false
Role: administrator
*/

piklist('field', array(
    'type' => 'group'
    ,'columns' => 12
    ,'add_more' => true
    ,'scope' => 'post_meta'
    ,'field' => 'newsletter_articles'
    ,'fields' => array(
         array(
			'type' => 'text'
			,'scope' => 'post_meta'
			,'field' => 'article_title'
			,'label' => 'Article Title'
			,'columns' => 12
			,'attributes' => array(
				'style="border-radius:3px; padding:10px; font-size:16px"'
			),
        ),
       array(
		    'type' => 'editor'
			,'scope' => 'post_meta'
			,'field' => 'article_content'
			,'label' => 'Article Content'
			,'columns' => 12
			,'attributes' => array(
				'rows' => 5,
				'style="border-radius:3px; padding:10px; font-size:16px"'
			),
        ),
        array(
			'type' => 'text'
			,'scope' => 'post_meta'
			,'field' => 'article_link'
			,'label' => 'Article Link'
 			,'columns' => 12
			,'attributes' => array(
				'style="border-radius:3px; padding:10px; font-size:16px"'
			),
       ),
        array(
			'type' => 'text'
			,'scope' => 'post_meta'
			,'field' => 'button_text'
			,'label' => 'Button Text'
    		,'columns' => 12
			,'attributes' => array(
				'style="border-radius:3px; padding:10px; font-size:16px"'
			),
    ),
         array(
			'type' => 'file'
			,'scope' => 'post_meta'
			,'field' => 'article_image'
			,'label' => 'Article Image'
			,'columns' => 12
			,'attributes' => array(
				'style="border-radius:3px; padding:10px; font-size:16px"'
			)
			,'options' => array(
			  	'modal_title' => 'Add File(s)'
				,'preview_size' => 'large-fb'
			),
        ),
   )
));

?>

Thanks,

Enrique

ok, after some hours of trying to figure the file.php out, I realized that if I save draft or publish eh post, the preview images are shown in their correct size. But that’s not what I meant.

What I wanted to do is that when I close the add media modal the preview image is in the size I defined in the options without having to save the post to see it. If that’s not possible, then it’s not big deal, I can live without it.

Regarding the sanitation, I added the code you sent me and I don’t see any difference, I was able to choose and add multiple images.

Thanks.

Enrique