I've been over this with Apple Support but they don't have an answer. Exporting from my own Apple Photos library as "unmodified originals" works as it should with HEIC files appearing on the destination drive. However when exporting what appear to be HEIC files from an Apple Photos shared folder in my library, the exported files appear as jepegs. I've tried the other Apple Photo export option ("Export 1 Photo") which give me the option to choose HEIC and which does appear as that after export except that it's file size is a least half the size of those I export from my own library. I suspect the file is being coverted from a jepg, not the unmodified original HEIC. I've posted this on an Apple Discussions fourm too. Has anybody tried this with and gotten the same result?
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