Greg, your approach is consistent with what I original posted (index “sub” and create an image-finding Smart Group) but I removed the suggestion because it is very easy to inadvertently cause DEVONthink to wreck a filesystem folder that’s been indexed. That’s fraught - especially if the original folder is managed as part of OS X – unfortunately, iCloud is a fragile implementation and making an error on one machine can propagate with unanticipated consequences on others.