Why can't I get this video to export to my camera roll?
On a completely different topic: DropBox and YouTube as the only on-line export options? Really? Vimeo would be nice for professionals who subscribe. Copy.com and Box.net seem like viable options as well.
Obviously, you can use Dropbox. You can choose to upload it to YouTube/Vimeo or you can attach your phone to your PC and use iTunes File Sharing to copy the videos to your PC. The videos will be in TimeLapse's photos folder.