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Hi, im having the same issue. were you able to find a solution?
I am also having the same issue. Did they manage to sort it for you? Currently i am having to convert them all to JPEG before i can use them!
yes, you have to convert them all. I did a mass conversion program for pictures for the last three years and converted them in large batches, It took me almost a day and a half (converting 4500) images and restoring them back to iPhoto, then deleting all the HEIC images. huge pain. Im bummed apple didn't tell us we could opt out of that setting and that it could be a compatability challenge down the road.