Shared form with image

$link = $fp->getLink('Choose a logo')
   ->withImage('logo')
   ->withValueTarget('logo');

$vars['sections'] = array(
   array(
    array(
     'title' => 'logo',
     'fields' => array(
      'logo' => array(
       'type' => 'image',
       'id' => 'logo',
       'edit' => TRUE,
       'image' => ee()->addon_settings->item('logo'),
       'value' =>ee()->addon_settings->item('logo')
      )
     )
    )
   )
  );