This doesn't work. Any ideas why?

ExifInterface exifInterface = new ExifInterface(filePath);

String o1 = exifInterface.readAttribute(TAG_ORIENTATION); //o1 is "0"

exifInterface.setAttribute(TAG_ORIENTATION, "90");
exifInterface.saveAttributes();

String o2 = exifInterface.readAttribute(TAG_ORIENTATION); //o2 is "90"

// relaunch app, read attribute for same photo

String o3 = exifInterface.readAttribute(TAG_ORIENTATION); //o3 is "0"
again, should be "90"

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