I bought this app to synchronize KeyStore between devices. Opening a file from the iCloud does not work most of the time. If it does, it does not checks hardly for changes. Neither there is a way to enforce this. Using the DB on multiple devices, will easily gets in conflicts state. The best way I found to resolve sync issues is resetting the sync, which throws away all of you local changes. Even without using it simultaneously you run into sync issues. There is no way to rescue your local changes, no local copy, local files are not accessible via application files, neither it is possible to export it.
The user interface is not intuitive neither. In the opening DB dialog it is not clear what information is required to provide in case the password is cached (using fingerprint instead). If you hit the wrong field, the password will be reset.