I am having preview issue in LR 6

[SirDan]

I just bought a new FX camera (Nikon D850). I am getting a message that says PREVIEW IS UNAVAILABLE when I upload the images in LR 6 to be processed. I can see the number of images, but I can I never encountered this issue before when I was unsing a DX camera. I would like to know what seems to be the problem, and how can I resolve it.

[Rob_Cullen]

First- Is that v6 for Mobile Devices (iPads, iPhones) or Lightroom v6 Perpetual from 2015?

The D850 camera did not have compatability support with Lightroom (Perpetual versions) until v6.13 / Classic v7 was released.

! SUPPORTED CAMERAS

You have three choices IMO-

1) Subscribe to the Photography Plan (20GB)  $9.99 PHOTOGRAPHY PLAN (USA) 

2) Test your luck to find a copy of v6.14  6.14 download VERY IMPORTANT INSTRUCTIONS Activation or Installing could be impossible!

3) Convert your NEF files to the raw DNG format.

DNG LEGACY SUPPORT

DNG CONVERTER