Cannot link many files to Organizer

Have used Organizer for 20 years.  For some weird reason, suddenly have over 700 pictures that cannot be linked to the files.  I think they were inexplicably sent to Recycle Bin, so I have restored all of these to a file, which I have tried in Pictures and on Desktop, but still the pictures will not link.  Any adice please?  Using the latest PSE.  Thanks.