Very confusing app

This app is very confusing to connect to device and does not synchronize with the device memory. After several clicks I found a screen where it reads the device measuring in real time and only then saves the readings. So, to save data to the app you need to have the app opened on you phone on a specific screen while measuring you blood pressure to be able to collect the data and create a log in the app. Also the app doesn’t distinguish the user 1 or 2 set on the device, it mixes as only one user.