A compatible Garmin device can sync its newly created user data with either the Earthmate® app, Garmin Explore™ app, or inReach® Sync. Some inReach satellite communicators can be plugged into a computer to transfer data to and from the device using inReach Sync. For information, see - Transfer User Data To and From the Garmin Explore Website. User data consists of waypoints, routes, tracks or activities.
For new customers, the default setting will be to sync everything in your Library when you pair a new device. Primary Collections are used to control where that new data ends up within the Library's Collections on the Garmin Explore website. The data transferred to a Primary Collection still appears within the Library.
Library and Collections are part of the Garmin Explore website account, used to store and organize data.
At this time, selecting a Primary Collection can only be done on the Garmin Explore website or app.
Log in to the Garmin Explore website.
Select Plans & Devices.
Select Collections next to the device.
Select Sync Selection.
Use the drop-down menu to select a Primary Collection for data to automatically sync to.
The Primary Collection for new data from the selected device has been set.
NOTE: For more information on Collections, see - Garmin Explore Collections.
To ensure your device is compatible with the Garmin Explore app, see - Devices Compatible With the Garmin Explore App.
Open the Garmin Explore app.
See Related for steps if the device has not been paired to the app before.
Select 
Devices.
Select the device.
Select Sync Settings.
Select Sync Selection.
Under Primary Collection, select the collection listed.
Select either the desired collection or create a new collection.
Select the back arrow to save the selection.
The Primary Collection for new data from the selected device has been set. For how to manually sync the Garmin Explore app, see - Syncing the Garmin Explore App.
When we turn off a list item it hides it from the map and interface. The lock is to prevent newly marked waypoints from getting marked and then being hidden immediately.
For more information see Setting a Collection to Sync Using the Garmin Explore App
For inReach devices that are compatible with the Earthmate app, the Primary Collection also dictates the data that is transferred to the paired device. For pairing steps, see Related.
For data created on the Garmin Explore website but not being seen on the device, it is likely that the Primary Collection has not been set, or the data is saved in another collection that is not set as the Primary Collection.
Once the Primary Collection is selected, any data saved to the Primary Collection automatically transfers to the device after syncing. The opposite is also true — any data created on the device automatically transfers to the Primary Collection and will be available in the Garmin Explore website after syncing.
For how to manually sync Earthmate, see - Syncing inReach Account Changes with the Earthmate App.