To sync the data collected by your iHealth Edge with the app, Bluetooth on your smartphone must to be activated.
Launch your app iHealth MyVitals and log in to your account
Then go to: MENU > Activity and Sleep > Sync
If your smartphone is connected to Internet, the data synchronized with the app will also automatically synchronized with your secure cloud space. Otherwise, they will be synchronized the next time your smartphone is connected to internet.
*credit to Sylvain of iHealth Labs EU
https://helpcenter.ihealthlabs.eu/hc/en-gb/articles/211659385-iHealth-Edge-AM3S-How-to-sync-my-iHealth-Edge-with-the-app-