How to export photos to an Extreme SSD

1 - select the photos in your library.

2 - use the File ➙ Export menu and select whether you want to export the original or edited version.

3 - in the next window select the location, in this case the external SSD.

4 - create a new folder on the external SSD and name it.

5 - complete the export by clicking on the export button.

If the external SSD is for only Mac use make sure it's formatted APFS.