Having FTP-ed an image, you'll see a green rectangle next to the thumbnail. Then, if you close the thumbnail tab, the green rectangle is forever gone. No way of telling if the image has been transmitted. I suggest that transmission details are permanently recorded (as metadata, in a separate xml file or wherever) and that you can review transmission history by clicking on the green rectangle.
I realize you can write a plain text ftp log file, but this is a cumbersome way of telling if a photo has been transmitted, at best.
Jarle