Some jpeg images won't sync to iPad
When I sync a folder to my iPad using iTunes some files don't copy. If I make a small edit to those files and re-file and then re-sync the file transfers OK. It's as is the file is corrupted in some way but I can open the files in all apps which handle jpegs and none report an error. The files are originally edited in CS6. It's only some files and the process to produce them is always the same. Any clues?
iPad, iOS 8.3