In GS 6, when multiple images are dragged onto a template, they are added in alphabetical order by image name.
In GS 7, when multiple images are dragged onto a template, they are added in reverse order alphabetically.
I have only just noticed this because I tried to use GS7 for listing prep for the first time today. The only workaround I can find is to drag each image into place manually, which is not a fix. I am left having to use GS6 to prep templates, and import those into GS7 for launch and maintenance after prep.