In the case of grouped images, it would be nice to have a key in the renaming interface with the filename of the main picture of the group. This is useful when treating bracketed image which are grouped together, for example: img1 img2 img3 are grouped on img1. I would like to be able to rename them img1-1, img1-2 img1-3 with a rule like [db:GroupFilename]-# Reproducible: Always