No Preview Available For This File - Importing Raw files to LRC using iMac

[almar199]

When I import onto my iMac Raw Photos from my memory card into Lightroom I get all the files greyed out with the message "Preview Unavailable For This File" . They will import properly but it's difficult to sort if I have several different subjects/folders that I'm importing. I have tried importing from the card onto other computers and it worked fine. Has anyone else had this persistent problem? 

[GoldingD]

Please post your System Information as Lightroom Classic (LrC) reports it. In LrC click on Help, then System Info, then Copy. Paste that information into a reply. Please present all information from first line down to and including Plug-in Info. Info after Plug-in info can be cut as that is just so much dead space to us non-Techs.

[GoldingD]

What camera?

[GoldingD]

And, outside if LrC, on your MAC, bring up,Security and Privacy, select Privacy, scroll down to Files  and Folders, make sure external volumes is checked

https://nektony.com/duplicate-finder-free/folders-permission

see; https://community.adobe.com/t5/lightroom-classic-discussions/dng-previews-from-leica-m10r/m-p/123180...

[Jao vdL]

There should be two places where you can select the memory card in the left hand panel. Try the other one from the one you normally use.