@Shiu - Yup!
@Shiu
I took another stab and figuring out why this wasnt working. here what i found.
All layers seem to need to be rastersized before it will pick them up in the script.
But i've found another bug.
If you give the output path a script such as "C:\images\"
when you import the json into spine none of the images will load (you will get a lot of "Missing" boxes. When you click the images folder you will see that path at the bottom is looking for ./images/ , so its not picking up the new path as specified in the script export dialog box.
Anywhoo, re-pointing it to the correct folder path loads up all the images correctly.