With the release of iOS 11, Apple announced that it was replacing JPEG files with a new image format called HEIC. HEIC photo is a default setting on iPhone 7 and laters. HEIC format could reduce your storage while the resolution is same with jpg.
However HEIC format is not compatible on Windows currently, which means you can't preview/view the photos on your PC after exporting.
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However HEIC format is not compatible on Windows currently, which means you can't preview/view the photos on your PC after exporting.
...
Read more