Unfortunately, it appears that the Dropbox synchronise functions from iOS devices has a broken link:
From iOS (iPad or iPhone) I click the cloud. After successfully logging in to Dropbox, (including 2-step verification), I am then asked to 'ALLOW' Theocbase to edit / view Dropbox files and folders etc. However, once I click 'ALLOW' it takes me to a blank white screen and nothing happens. When I go back to Theocbase, it has not syncronised and simply asks me to repeat the process of logging in > Allowing Dropbox to access Theocbase files etc.
If I try and view the blank white page on a web browser it displays a Dropbox error page: Error (4xx) We cant find the page you're looking for.
Thank you for your hard work and help.