Sorry .. I don't recognise whatever it is that you are using to view the files.Here's the SD card in the computer
Perhaps it's on an Apple device?
It appears that your viewing software doesn't recognise dng files, so isn't showing them.
No matter ... you need to use something else to see what's actually on your card, not just some of the files .... like the screenshot I showed earlier.
But I'll go back to my earlier question.
What's your photographic experience?
Do you really need to use dng files?
There's nothing wrong with the jpg files produced by DJI cameras.
They are all that most users would ever need.