Why do my steps only update when I open the app?
Apple Health and Health Connect send your data to YuMuuv when you open the app, so open it at least once a day.
To sync straight away: profile circle (top right) → Your details → Update your data.
Your steps stay saved in Apple Health or Health Connect, so nothing is lost if you forget for a few days. They come through the next time you open YuMuuv. If you haven’t opened it for a long time, older days may not come through; contact support.
Garmin, Polar and Suunto sync in the background: Garmin within a few minutes of your watch syncing to Garmin Connect, Polar and Suunto about once an hour.