I've finally completed customisation of both my 4001V63s, commenced late last year. I tried uploading a shot to show how beautifully they've both come up, but I got the following bemusing message.
The image must be at least 0 pixels wide, 0 pixels high and at most 0 pixels wide and 450 pixels high. The submitted image is 1056 pixels wide and 1408 pixels high.
I tried resizing to bring the height down to the specified maximum of 450 pixels, but the shot it then so small as to be almost illegible. More perplexing, however, is the specified maximum width of 0 pixels – now that's REALLY tough!