User blog comment:MisterWoodhouse/Social Activity, the 2010 Editor, and Unpausing Migrations/@comment-29634455-20201002221710/@comment-3359255-20201004001120

It seems a lot of code (css and html) does not function properly in the move. I think a personal bot could change the gallery code (replace x for y on all pages) but I have no idea how bots function in the move....I think it is easiest to do it manually. I added a gallery code (in source mode) to Elliot Clayton's page which may help you further. Good luck!