learndash_register_essay_upload_metabox This function has been deprecated. No replacement instead. learndash_register_essay_upload_metabox() Registers the essay upload metabox. ContentsDescription Source Changelog Description # Fires on add_meta_boxes_sfwd-essays hook. Source # File: includes/deprecated/3.2.3/functions.php Changelog # Changelog Version Description 3.2.3 No replacement. 2.2.0 Introduced.