Не работает загрузка аватара

Есть отдельная функция для загрузки изображения:

    public static function profile_picture_upload() {
        $msg = null;
        if (Functions::verify_nonce() && isset($_FILES['pp']) && $user_id = get_current_user_id()) {
            Filters::beforeUpload();
            $status = wp_handle_upload($_FILES['pp'], ['test_form' => false]);
            Filters::afterUpload();
            if ($status && !isset($status['error'])) {
                // $filename should be the path to a file in the upload directory.
                $filename = $status['file'];
                // Check the type of tile. We'll use this as the 'post_mime_type'.
                $fileType = wp_check_filetype(basename($filename), null);

                // Get the path to the upload directory.
                $wp_upload_dir = wp_upload_dir();

                // Prepare an array of post data for the attachment.
                $attachment = array(
                    'guid'           => $wp_upload_dir['url'] . '/' . basename($filename),
                    'post_mime_type' => $fileType['type'],
                    'post_title'     => preg_replace('/\.[^.]+$/', '', basename($filename)),
                    'post_content'   => '',
                    'post_status'    => 'inherit'
                );

                // Insert the attachment.
                $attach_id = wp_insert_attachment($attachment, $filename);
                if (!is_wp_error($attach_id)) {
                    if ($existing_pp = get_user_meta($user_id, '_rtcl_pp_id', true)) {
                        wp_delete_attachment($existing_pp);
                    }
                    update_user_meta($user_id, '_rtcl_pp_id', $attach_id);
                    wp_update_attachment_metadata($attach_id, wp_generate_attachment_metadata($attach_id, $filename));
                    $src = wp_get_attachment_image_src($attach_id);
                    $data = array(
                        'pp_id'   => $attach_id,
                        'src'     => $src[0],
                        'message' => esc_html__("Successfully updated.", "classified-listing")
                    );
                    do_action('rtcl_user_pp_updated', $data, $user_id, $attach_id, $_REQUEST);
                    wp_send_json_success($data);
                }
            } else {
                $msg = $status['error'];
            }
        } else {
            $msg = esc_html__("Authentication error!!", "classified-listing");
        }
        wp_send_json_error($msg);

    }