The photos most probably, but but he just use verb in the text so I didn't repeat the subject like "if you arrange the photos..."
He means "if you can manage, if you can make it in the way of sending".. etc
OK cheesecake, the case is that "arrange" is a transitive verb so you have to place an object after it
What about this?
"If you can arrange my photos, you will send them to this address, won't you? Take cafe of yourself."
In the original, the first part doesn't mean the same thing. ''ayarlayabilirsen''--> ''if you can arrange'', the person is not talking about the photos. It's something like ''if you can find a solution for that, you will send my photos to this adress''.