I think this is correct. I believe that if shooting DNG then there will also be an associated low-rez JPG thumbnail preview created as well, because most devices won't view the actual DNG file. The way to be sure is just to check in-app and see what you are storing when capturing a photo (JPG or JPG+RAW).Is one of the JPG and the other DNG? If so the DNG is a Raw file that needs to be processed, you are most likely just seeing the preview of the thumbnail enlarged.
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