Does anyone know why there would be HTML files on the memory card that has the file name the same as the pictures and video?  They are always in the same folder as all the pictures.  

I have seen them in the directory with panorama pictures.. I guessed that they might be a page to view the panos in a browser but I have never bothered to look at them.

It labels which pics and order taken were in your panorama. I'm guessing it's what the DJI app needs to stitch panos.

As I use ICE or DJI Mediamaker for my panoramas, I delete them when downloading from the SD card.
Actually, they are ONLY in the Media (movie, single pictures) folder and ONLY pointing on to the folders with the same name in the Panorama folder. On my SD card.
I assume, Bing Err is right

I see the correlation to them now, thanks.