Change the Featured Image Box and upload link Labels for Custom Post Type

Custom Image Upload box for CPT

/**
 * Change the Featured Image Box and upload link Labels for Custom Post Type
 * @link https://wordpress.org/support/topic/relabel-featured-image-on-custom-type
 */
 
 /*This section changes the label of the image box*/
 add_action('do_meta_boxes', 'change_image_box');
function change_image_box()
{
    remove_meta_box( 'postimagediv', 'staff', 'side' ); /*Alter the word "Staff" to match the name of your CPT */
    add_meta_box('postimagediv', __('Photo of Church Worker'), 'post_thumbnail_meta_box', 'staff', 'normal', 'high');
	/*Photo of Church Worker and staff are the replacable labels and CPT names respectively*/
}

 /*This section changes the label of the upload link */
add_action('admin_head-post-new.php',change_thumbnail_html);
add_action('admin_head-post.php',change_thumbnail_html);
function change_thumbnail_html( $content ) {
    if ('staff' == $GLOBALS['post_type']) /* Change staff to match the name of your CPT */
      add_filter('admin_post_thumbnail_html',do_thumb);
}
function do_thumb($content){
	 return str_replace(__('Set featured image'), __('Upload the Photo'),$content);
}