Remove value from array within post meta ajax admin

I have an array within the post meta for a post. I want to be able to list out each individual element of the array in the admin area and delete a value from that array.

I currently loop over each of my array elements and attempt to use ajax to delete them, when I click on the delete button it sends the value to my ajax action, I then load the post meta I want, remove the value and then update the post meta. However my console.log(data) brings back 0 every time and doesn’t fade the div. Can anyone see why?

function print_pdfs_attached() {

    global $post;

    $attached_pdfs = get_post_meta( $post->ID, 'pdf_upload_url', true ); ?>

    <p>All PDFs attached to the article</p>

    if($attached_pdfs) { 
        foreach($attached_pdfs as $pdf) { ?>
            <div id=<?php echo $pdf; ?>>

                <p><?php echo $pdf; ?></p>

                <input type="hidden" value="<?php echo $pdf; ?>" id="ajaxtestdel_postid<?php echo $i ?>">
                    <th scope="row"><label for="del">delete</label></th>
                    <td><input type="button" name="del" id="del<?php echo $i; ?>" value="delete" class="button"></td>
                  jQuery('#del<?php echo $i; ?>').on('click', function(){
                    var post = jQuery('#ajaxtestdel_postid<?php echo $i ?>').val(); // get post id from hidded field
                      url: 'admin-ajax.php', // in backend you should pass the ajax url using this variable
                      type: 'POST',
                      data: { action : 'ajaxtestdel', postid: post },
                      success: function(data){
                        jQuery("#<?php echo $pdf; ?>").fadeOut( "slow" );
    else { ?>
        <p>No PDFs are currently attached to this article</p> <?php

function ajaxtestdel(){
    global $post;

    $currentPdfs = get_post_meta( $post->ID, 'pdf_upload_url', true );
    $postValue = isset($_POST['postid']) ? $_POST['postid'] : '';
    $array_without_strawberries = array_diff($currentPdfs, array($postValue));
    update_post_meta( $post->ID, 'pdf_upload_url', $array_without_strawberries );

add_action('wp_ajax_ajaxtestdel', 'ajaxtestdel');

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