You can rename a file from the main Designs area but you cannot when viewing from the Recents list. Tapping the name works just fine from Designs but after switching to Recents tapping the name does nothing.
It would be good be able to rename the design while you have the design open to negate having to come out of your design, name it, then go back in. Also being asked to optionally name it when creating a new design.
Sean