RadImageGallery is a great control and supports many image formats out of the box (JPEG, PNG, BMP, etc.)
However, it does not provide native support for HEIF. HEIF is now the default format for most Apple devices (anything after iOS 11 update).
It would be great if RadImageGallery were updated to provide support for this format so that developers don't have to force image conversions of photos taken by Apple devices.