When downloading from A360, you are presented with a number options.
In order to get the exterior skybox to appear in your image- use the "Download for Gear VR" option from A360, this generates a PNG and JSON file.
After your download is complete, you will need only to rename and upload the .PNG file to your Scope library.
If you do not choose these settings when exporting the default skybox in A360 will not be rendered and instead you will see black areas or boxes where the sky would otherwise appear.