If your USB flash drive is not copying files, format your file type to NTFS. However, you may also need to gain administrator permission to fix the issue.

How to connect an external USB drive to your PlayStation 5 console, and move games and apps between internal and external PS5 storage.

See how to transfer your files from an old hard drive to a new computer running Windows 10 via OneDrive. WiFi, LAN, Software, etc.