overriding master study lesson content

// add filter
add_filter( 'stm_lms_lesson_content', 'stm_lms_override_lesson_content', 10, 3 );

// override lesson content (scorm example)
function stm_lms_override_lesson_content( $template, $post_id, $item_id ) {
		$lesson_type = get_post_meta( $item_id, 'type', true );
		if ( $lesson_type === 'scorm' ) {
			$this->enqueue_scorm_scripts();
			$scorm_url     = false;
			$scorm_meta    = false;
			$scorm_package = get_post_meta( $item_id, 'scorm_package', true );
			if ( $scorm_package !== '' ) {
				$scorm_meta = SCORM_Helpers::get_scorm_meta( $item_id );
				$scorm_url  = SCORM_Helpers::get_iframe_url( $item_id );
			}
			ob_start();
			load_template( plugin_dir_path( __DIR__ ) . '../stm-lms-templates/scorm.php', true,
				[
					'course_id'  => $post_id,
					'post_id'    => $item_id,
					'item_id'    => $item_id,
					'scorm_meta' => $scorm_meta,
					'scorm_url'  => $scorm_url
				] );
			$template.= ob_get_contents();
			ob_end_clean();
		}

		return $template;
	}