Insulation under shed attic floor only?

[remagenman]

Hey folks, I'm about to embark on a fiberglass bat insulation of my 12x16 shed which I have a attic space with a floor using OSB plywood on top of 2x6 joists.

I was going to insulate the rafters on the roof but work will be way easier if I just insulate underneath the attic floor, using less fiberglass batt and just easier to install. I have a opening to the attic but I can make a door since this attic space would only be used for storage.

Is this okay?

Thanks.