Ok, so a lot of people who I've made trailers for, come back to me asking the same question:
HoW To PuT ViDeOs On WaTtPaD?

And me being the epic person I am will show you how to, (for phone and laptop)

Or maybe I'm just tired of explaining......

But anyway, here they are:

Alright so that one is for laptop.

For phone users you can use this:

Yup, I know I'm too kind.

Well, technically DeathBlade__ made the phone part, so you can thank her as well.