To sync a third-party app with fatsecret, make sure the app supports data sharing and that you’ve granted the necessary permissions. Then follow these steps:

1. Open the Diary tab in the fatsecret app.
2. Scroll down and tap “Add Exercise/Sleep.”
3. Select “Apps & Devices” and choose the application you wish to sync with.

If you’re experiencing problems syncing a third-party app with fatsecret, the connection between devices may have been lost. Try these steps to resolve the issue:

1. Refresh both the fatsecret app and the third-party app.
2. Open your third-party app on your phone.
3. Wait a minute or two, then reopen the fatsecret app. Your data should sync automatically.

If syncing still doesn’t work, check that your third-party app is connected properly and has the latest updates installed.