I suspect the new PC has changed the original file paths. Is the device recognized in the Folders section. Or if you can launch the catalog on the old PC is the device still visible there?
You can normally right-click on “Imported Photos” and choose Show in Explorer or Show in Finder to be taken to the smart previews.
In LrMobile on your mobile device, can you see those photos?
No, all photo have been removed from my mobile device, i have checked usage on the iPhone and LR Mobile is now only 80MBs instead of being around 5GBs meaning the photos are not just hidden they are gone.
Hi 99Jon - on LR i can still see the smart previews of the photos from my mobile device but nothing shows up when checking imported photos. I suspect by using a new PC the collections have been unsynced leading to all photos being deleted of fmy mobile device - not 100% sure of this though.