Not necessarily. Just photos I have taken and put under "Pictures."
Various. From my Canon, Dropbox, etc., for many past years. I've always been able, before, to rotate and copy. I also cannot copy Document files.
Disk is OK.
I can wait.
OK sorry for the delay in Preview you go to Tools and you can rotate the picture for one thing, see here:
Sorry. Attention got diverted. I'll try the iPhoto. I'm trying simply to make a copy so I can have the same photo in two different folders.
In Preview you can just go to File / Duplicate and then File / Move to very simple: