If I am filing for an extension of time based on a request for an extension submitted on Form 5558 with the Internal Revenue Service, do I need to attach a copy of the Form 5558 to my Form 5500?

You do not need to attach a copy of the Form 5558 that was filed with the Internal Revenue Service to the annual return/report in EFAST2. You must, however, keep a copy of the Form 5558 that was [...]