Overs the years I've used Dropbox to backup my pictures and videos. However I recently got a new iPhone, and I want to move all my photos/videos back onto my iPhone. From what I can tell, the best way to do this is using iCloud Photos.
But I now see that Dropbox have converted most of my photos into .jpeg and most videos into .mov. This deviates from iPhones native format which seems to be .heif (for photos) and .hevc (for videos).
Does anybody know how to convert the files back to iPhones native format?
The .jpeg photos are much larger size than .heif, and I lose the "live" portion of the photos. The .mov files (at least the newer ones) simply won't sync to iCloud Photos; I've tried to convert a video into .mp4, which iCloud Photos accept, but quality seems to take a hit.