Hello 3DWinter,
Change path option is case sensitive, so if you have JPG in camera labels, it should be the same in the filenames.
Change paths work in the following way:
- select the images in the Photos pane you wish to change paths for,
- right click on selection and choose Change Paths option,
- choose Apply to Selection option,
- point the path to the single image from the selection and click OK,
- the paths for the rest of selected cameras would be changed accoridngly.