Can't share boards between devices – Spelling Bee Lists 1000+ Spelling Tests Grade 1-12 Review

Happy to have the app, nice games. However, I am highly disappointed that even after signing up for an account, I am unable to back up and/or share my boards between devices. I have tried uploading to Bits boards (nothing shows up), Dropbox (login fails to link anything and message about unsupported), Quizlet (does nothing). Help files are worthless, they just link to defunct sites.
Review by Auricana on Spelling Bee Lists 1000+ Spelling Tests Grade 1-12.