I just wanted to make pictures of my laptop PC on my PC and this via a USB but he does not show the existing files, where is the problem?
Plug the stick back into the laptop. Are the pictures displayed there?
Yes
Click in Windows Explorer on the right side of the USB stick and then on "Properties". What is there with file system?
Do you have Windows 10 on both computers?
Nope on an old one no idea which and on PC windows 10 yes
So I guess it's the filesystem. Reformat the stick and select Fat32.
Try another USB port on your PC. (or one after the other until you have all through)
If it is a new USB stick, but your PC is already a bit older, there may also be problems with compatibility (there are different USB versions).
What is not displayed? The whole USB stick not? Or just the files on it?