SiteBuilder currently uses IMAGES folder(internal id: -4). That's also where the image is saved when adding image through item record. (ITEM DISPLAY IMAGE field)
SCA uses anything that is set on Website Setup > Images tab > IMAGE Folder. However, it seems that you can only select a folder under Live Hosting Files folder.
At the same time, I can only select folders from Images for SiteBuilder. Is there any setup that can be changed so we can use the same folder for both sites?