Import trip

See https://optimoroute.com/support-export-routes-to-garmin-tomt..., specifically the section titled "Uploading .gpx files to Garmin devices".

From Garmin support. https://support.garmin.com/en-US/?faq=8KwavpWRiJ6QZFoBjURXa7...

You shouldn't need to "import" it. After booting up, trip planner should import automatically.

However, if you delete the route, I haven't found a way to reimport it without renaming the filename to something else.

To transfer data from BaseCamp for Windows to a device:
Connect the device to your computer
Select an option:
To send one or more items or a list to the device:
Click on an item, a list, or multiple items (using CTRL+Click or Shift+Click)
Click the Device drop-down menu
Hover over Send To Device
Click on Send ['Name'] to Device orSend Selection to Device
To send all saved data to the device:
Click on the My Collection folder
Click the Device drop-down menu
Hover over Send To Device
Click Send 'My Collection' to Device
Select the device to which you want to send the selected data
Click OK

Please let us know when you get the problem fixed.