Dyrii using Apple iCloud for storage. We have written custom sync solution on top of iCloud to refresh your data on all your devices.
To enable this function on iOS, navigate to Settings/Storage and select iCloud as the option. Sync cannot be enabled unless you select iCloud for data storage. Once selected, sync will automatically turn on if you are a premium user. We have also provided setting to disable sync when not on Wifi which can be accessed from Settings/Manage Data/Sync.
On the Mac, this option resides in the top toolbar as indicated in the screenshot below. This option can also be enabled from the Preferences settings as indicated in the below screenshot.