Just fyi,
I imported a simple sprite sheet, with the same amount of space for each sprite & no padding. The import worked well.
I then added an extra sprite to the sprite sheet. Edge didn't auto-update the sprite sheet. I had to import it again as a separate sprite animation, which is fine.
I haven't compared an .eas file with one of texture packer's exports. I can change an .eas to a txt file, so I'm curious whether I could change one of texture packer's exports to an .eas file. If it's in the same format as an .eas file, then I'm guessing it should work. I'll play with that pretty soon.