I will state first that while I've used other animation programs in the past, I'm very new to this software, so this could be a user error. However, I did search this issue extensively and tried everything I could find, so this may be a bug with the program.
After exporting a sequence of png files and the accompanying JSON from Photoshop CS4 using the included script, I attempted to bring these into Spine. By using 'import data,' I was able to bring in the JSON, but the images themselves won't seem to load in, displaying red rectangular outlines in their place. I then followed the instructions to manually select the images folder with the 'images' directory on the right side, but nothing updated, and I cannot find a way to directly attach the png files to the 'missing' image locations, either. However, all imported layers are named and placed correctly, although there are no images shown. When clicking 'open' at the bottom, it will display the folder with the images in it, but I cannot seem to do anything with them.
I am running Spine 3.6.35 Professional, which I just updated today, on a Mac with OS 10.12.5. While this could just be the result of me missing something really obvious someplace, I've retraced my steps very carefully many times, and I'm at a bit of a loss on what to do from here. It is especially concerning since I've looked at other posts in which image files were missing after importing a JSON from Photoshop, but selecting the image folder manually(as they did) doesn't seem to be fixing the issue for me. Hopefully someone will be able to help with or explain this. Thank you.