Ez Expense Manager files are not syncing between my iOS devices

Forget the Dropbox file chooser in ez expense ...  cause seems only works for android. Can't see choosing and importing / exporting files from Dropbox will work be when both devices are looking at different Dropbox file lists ( although logged into same account. The iOS files are different. No option to set in ez expense........   where it is uploading and downloading files. The two devices apps for ez expense.... and Dropbox are working in their own little worlds within iOS and neither the Twain will meet. Options within ez expense... are "iCloud backup" with export/ import to csv or "Dropbox sync" which includes connect/disconnect from Dropbox, upload/download (no choice of destination), upload/download csv, open Dropbox chooser. Using csv file it only uploads each account individually within the database which is not worth doing with four accounts currently in database. According to another review I've just seen they say it won't upload csv as well as database in iOS. They were able to email but data was mixed up and didn't import correctly. This review was three years ago so seems developer has abandoned trying to support iOS. Think main problem is not being able to sign in/set Dropbox as a storage/cloud account within iOS like I could google. Then it would be accepted as a single account within iOS, using with the downloaded app seems to treat them as two separate individuals. Can't see how to add Dropbox as cloud storage as can only add email accounts .