Nice video. 🙂
You are fast, but still so many clicks to setup a skeleton. I don't notice so much when I'm the one clicking. Maybe a little helper dialog would help.
https://trello.com/c/YtpwbvSb/128-dialo ... a-skeleton
I've added the ability to set the atlas extension so you Unity guys don't have to do a rename every time.
Loading Image
I fixed right click > Create > Spine Xxx
to create the asset in the right place.
As for your actual problem, I'm guessing Unity is mucking up your textures since you are using 2048x2048. From the notes here:
Unity scales large images down by default if they exceed 1024x1024, which causes atlas coordinates to be incorrect. To fix this, override the import settings in the Inspector for any large atlas image you have so Unity does not scale it down.
Cheers!