Short answer: Go to Profile > Settings > Health Data and tap Connect Health Connect. Read the short notice about what is shared, continue, and allow the data types. Dose Track then reads your weight, sleep, heart data, body fat, blood pressure and more.
Before you start: Android 14 and later have Health Connect built in. On Android 13 and earlier, install Health Connect from the Play Store first.
Dose Track reads about the last 30 days from Health Connect, the window Health Connect allows. Data it already pulled in earlier stays in Dose Track.
It reads from Health Connect and does not send your dose logs to it. Editing or deleting a synced weight entry in Dose Track changes it in Health Connect too. The data is kept on your phone unless you turn on encrypted backup.
Open Health Connect (on Android 14: Settings > Security and privacy > Privacy Controls > Health Connect), go to App permissions, pick Dose Track and turn the data types on. Then tap Reconnect Health Connect in Dose Track.