Losing exif data from image files

i’m new to this NAS device (WD My Cloud EX2 Ultra). it’s replacing a regular My Cloud that died. :frowning:

i’m doing a simple drag and drop from an images folder on a MacBook Air to the EX2. the Air is on wifi; the EX2 is cabled to the router.

after dragging a file to the EX2 i go look at the exif data and there is nothing there, even though the original file has all the usual stuff - device, aperture, shutter speed, etc.

is this a result of the drag-and-drop process? do i have to use a backup app instead?