Show the Frontend Custom User Profile Image - within MB Admin Columns

Hi there,
I use a custom field for a profile picture on the type => 'user' MB frontend user form where users can upload a custom image using a 'file_upload' field. I know this is straight forward using the 'image_upload' field where there is no need to create a custom admin column, I can simply show it like this in the custom field itself:

'admin_columns' => [
    'position' => 'before username',
    'title'    => 'Profile Picture',
    ],

I know this works fine.

However, for technical reasons I need to use the 'file_upload' field for the job - but the above method does NOT show the user uploaded image in the admin column for the 'file_upload' field type? Just a link to the image?

So I thought I would create an action hook following your documentation to show it. Here is what I have so far....

`add_action( 'init', 'prefix_add_profile_columns', 20 );
function prefix_add_profile_columns() {
class Prefix_Custom_Profile_Columns extends \MBAC\Post {
public function columns( $columns ) {
$columns = parent::columns( $columns );
$position = 'before';
$target = 'username';
$this->add( $columns, 'profile_picture', 'Profile Picture', $position, $target );
// Add more if you want
return $columns;
}
public function show( $column, $post_id ) {
switch ( $column ) {
case 'profile_picture':

// My image query to go here.

break;
}
}
}

new Prefix_Custom_Profile_Columns( 'user', array() );
}

Right now the custom admin column does not even register (show) in the 'users.php'. What am I missing? Or is there another method?

Thanks in advance 🙂