I had the same problem recently with Windows 10 photo viewer... The Windows 7 viewer would actually rotate & save the rotated version w/o having to perform additional steps.
So, assuming you're using Windows 10...
The Windows 10 viewer main window Rotate function (between Edit & Delete) only shows it rotated, but doesn't actually rotate it. But you can actually rotate it within 10's viewer. Select the Edit tab just to the Left of Rotate, 2 new tool bars will open. If you the select rotate, (Right side tool bar - between Enhance and Crop) it will actually rotate the image and save it that way for any other applications that use the image.
Or you can open the image in another image editor and rotate/save it from there.
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