Why is this happening?!!
Help!? In the Photo library on my iMac, hundreds of photos and videos dating back to 2006 now appear with a '?' icon in the top right corner of the thumbnail. When I open them I get the following message: Missing File: Photos with unavailable original files cannot be opened. The original photo “IMG_2970.HEIC” is either offline or cannot be found. Click “Find Original” to reconnect. When I click "Find Original", I cannot locate the folder with the original. At first, I thought it was just a few, but a more thorough search revealed nearly 1000 files, including 137 precious home videos. I've called Apple Support and the issue remains unresolved after half an hour on the phone. Does anyone know (a) how this happened; and (b) if there is a way to either find the missing originals OR convert all of these missing/referenced files back to an editable format. My photos are my most prized possession and without being able to open/access/edit/print them, I feel heartbroken.
iMac 27″, macOS 12.7