When creating a new account in the Garmin Explore app, you will receive a permissions prompt asking if you agree to allow Garmin to receive and store your data. If "Do Not Agree" is selected, synced data (waypoints, routes and tracks) will only appear on your handheld and in the Garmin Explore app. None of your data will appear on the Garmin Explore website. If you wish to have your data available on the Garmin Explore website, you must agree to the Data and Privacy statement.

Garmin Explore App Prompt Asking if You Want Garmin to Store Your Data

Changing the Data and Privacy Permission

Open the Garmin Explore app
Select
Select Data and Privacy
Select Data Storage
Select Agree

After agreeing to the Data and Privacy statement, sync your device again to start sending your data to the Garmin Explore website. If you wish to change this setting at a later time you can do so by selecting Opt Out from the same "Data Storage" section of the Garmin Explore app.