Hi Jill Hurst,
I hope you are doing fine.
The files that you are talking about, are these the files that you have just imported or are these some old files that you have in your finder?
Do you import raw files in LR or use Copy as dng option during import?
Yes files that I am importing from my Nikon D810
I use Copy as DNG
and Choose make a second copy.
Thank you for responding!
Would you please check the location of your second copy?
Whether its the same location where Lightroom is copying the DNG files or its different.