Comentario oficial
Maps Made Easy only processes JPG images. Exporting DNG files can be done but it is hard to do correctly and still be able to use the DJI workflow. The DJI workflow test for some very specific tags being present. If they are not there you may still be able to use the Classic workflow.
This exact topic is discussed here:
https://support.dronesmadeeasy.com/hc/en-us/community/posts/360055740292