Can't move photo

Hi please can you tell me why I can't select the photo in the top left frame to reposition the photo inside the frame? You can see the layers panel on the right. I've tried to figure it out myself but have to admit defeat. It's the photo with the name starting 1.A. I have had no problem with this 20-page document for the many weeks I have been working on it. I have had this problem with a different document and the solution there was to move it to top of the layers panel and bring to front using object menu. I have done both those things with this current document but this time it hasn't fixed it. Thanks in advance.