I have been using Diarium for a week and was successfully able to sync both my iPhone(iOS) and my MacBook(macOS). Recently, when I'd type an entry on my iPhone, it wouldn't sync to my MacBook. I tried pushing the sync button and it recommended that I get the Pro version for 8.99. I didn't mind because I really enjoy the app, but when I tried to sync on my iPhone, it tried to get me to pay 5.99 to get the Pro version of the app. I use the same iCloud on both devices, and I'm confused on why I have to purchase the Pro version on both devices.
Diarium version: 2.8.18
OS + version: 15.2.1