Is it possible to add a certificate to on demand training?

afctraining  GoToTraining Catalogs are loosely related events that don't have any direct relation outside of the grouped landing page.  I'm afraid there are no settings for confirming completion of all events within.

Can I set a setting to the material can be accessed upon completing the catalog only?

I see I can add a materials but it showing as send now option only on mine. 

Thank you, that's perfect. 

Yes, Anytime Trainings can have Materials and Tests just like regularly scheduled GoToTrainings.

So it works the same way with recordings in a catalog?

afctraining  Yes, you can make Materials available only after a GoToTraining session is complete:  https://support.logmeininc.com/gototraining/help/create-and-manage-materials-g2t020015

Can I add my own certificate to a material attachment and attendee can access upon completing the recording?