Use this method to add the current Exif information to an
existing JPEG. You can specify your JPEG using either a file path
or using raw data - an array of bytes.
IMPORTANT: this method has only been partially implemented. It
will discard any modification you have made to the Exif properties.
It will only preserve the original Exif information.
If you pass this function a path to your JPEG it will return the
same path. If you pass this function raw data it will return an
array of data representing the new JPEG image.