The system suggested I start a new topic for this, so here goes.
I'm shooting with a Leica M8.2 camera, and using PhotoMechanic 6 to copy the photos from my SD memory card in my iMac to a folder I created on my system. I want to use Adobe's DNG converter, and while my accidental attempt resulted in it converting the photos on the SD card, at least it sort of worked.
I would normally ingest the photos from the SD card into the new folder I've created.
I would like to use Adobe's DNG converter to replace the Leica DNG files with Adobe's version, containing a preview image.
Then I would delete images until I was only left with the good images, with would be imported into Lightroom.
If I use the DNG converter after having ingested the photos with PhotoMechanic, I end up with double images. It worked, but I doubt that's the right way to do it.
What is the simplest, easiest, preferably fastest way to get my Leica DNG images on the SD card into the new DNG format, such that I can edit with PhotoMechanic as I used to do?