Over the last few months I lost several important movies. I imported them from my iPhone via Photo's to the desktop, from there I dragged them into iTunes Home Movies. They work fine for a few days, but after that (e.g. while syncing my iPad) I get the message 'This video cannot be played because the original couldn't be found, would you like to locate it?' The movies are solidly gone, never to be found again. Some I backed up, some are lost forever. Am I the only one experiencing this flaw? What could be the explanation? (iMac, El Capitan.)