The photo gallery requires photos to be of a certain maximum size. If you don`t have photo editing software, this can be a pain. I found a free web based resizing tool, that you don`t need to download software. This also might be handy for posting images of an event from a motel room. http://www.resize2mail.com/
Whenever I load pics in the Manx Gallery it sizes them as needed. I have never had to manually resize them. I know of several other sites that you need to resize photos for.