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Have you checked there is sufficient storage on the USB disk your copying too?
What happens if click a single file and go to copy, is there an option to paste then?
I just wanted to rule out it being a read-only setting on the storage device, what happens if you have the two windows side by side and drag the folder from current location to the storage location?
When that happens it suggests there is a lack of free storage on the device.
Reboot the laptop, while its rebooting plug the drive into a different USB port, and let me know how you get on.
How did you get on after the reboot and using a different usb port?
Great, so I can close the case please rate the service received using the star rating at the top.