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Attached ont of these DNGs.
The file appears to be a (little endian) tiff, I read the magic hex number: 49 49 2A 00. Various image software claim the file to be corrupt.
Edit: Changed file extension .tif (what I get when downloading) to .dng and file opens in Affinity Photo2 (Windows). The file may not have the embedded jpeg image that PM requires. Some cameras do not embed a jpeg version of the image. You may try to embed the jpeg image version using Adobe DNG converter tool or Lightroom.