Old photos missing and old videos unplayable
Old photos that once upon a time were viewable in iPhoto now show up at blank images (with a filename). Old videos (also previously playable in older versions of iPhoto/Photo software) give errors stating 'Cannot Play Video - Photos cannot play this video because it uses an unsupported format." Most, if not all, of the photos/videos were taken using iPhones (going back several generations). All of the affected photos/videos were taken before 2013. None on the photos/videos before 2105 are in the Masters folder within the 'Photos library.photoslibrary' folder. Where can I find the folders of these older images/videos, so I can retrieve them? What else can be done to figure out where these files actually are on my computer?