Please go to the Library Module, and then Click on Photo in the Menu Bar, and then Click on Stacking.
From there please select expand all stacking.
It should show all the images if they are the virtual copies.
Unfortunately this was my first action - to expand all stacks... No results. Strangely enough, in one case Lightroom says there are 4 pictures in a stack and when I expand,then there is 1 of 4, 3 of 4 and 4 of 4 - 2 of 4 is somehow missing...
Could you please click on the Library Option in the Menu bar and then click on " Find All Missing Photos ".
Please see if it shows any images as missing .
No, it shows only (correctly) video files, which I have on another drive, not connected at the moment...
I must add that this problem started after I moved a bunch of folders from my laptop's internal drive to an external one - of course I did all this within Lightroom.
Of course you were right and I was not - instead of "expand all stacks" I've selected all photos and chose "expand stacks", which apparently is not the same