I'm having trouble uploading pics from my computer to my attachments area. Never was a problem before. Same camera, same sd card, same pc. Is there a limit to the size the images can be? Most of these are 2mb or a little more. I don't know how to make them smaller. What makes an image larger, say 2 mb as apposed to some pics that are only 1.5 mb or so? Camera is just an old Canon Power Shot A560. 7.1 mega pixels.