Are you using the new app or the old one? if you are using the new one it will not be able to pull the videos made with the old app so try installing the old one and then see if it works.
Old app https://play.google.com/store/apps/details?id=co.touchlab.android.onesecondeveryday
New App https://play.google.com/store/apps/details?id=co.onese.android