I have been using a memory stick for years for my cameras. For some reason when I take the stick and put in the computer to copy the pictures, then return the stick to the camera, the photos do not show on the camera anymore. They are all still there and viewable on the computer, but most do not show on the camera anymore. This has happened with 2 different types of memory sticks, and the pc's, 1 desktop, 1 laptop. Nothing unusual, no special programs, just view folder, copy pictures - do not delete.
Then, I did the same thing, but deleted all the pictures after copying them, tried to add some back from various places on my computer, all show on the memory stick on the computer, but only 5 of 40 show on the camera? help please :) And sometimes it will only copy pictures, not videos, why?
I did try the folder view on 1 camera, this did not help.