I created a brand new sd card boot - for Raspberry Pi OS
booted fine, and wanted to create another copy, so I plugged in a new USB SanDisk Ultra 64g into one of the USB 3.0 ports on the side of the Raspad3. It was NOT detected by the OS.
I tried all the external ports none worked.
I then powered down and removed the newly created sd card, and put it into my other Rpi4 booted fine, and plugged in my USB SanDisk Ultra 64g, and it was detected immediately - and launched SD Copier and successfully made my copy.
I also noticed another problem, using the Raspberry Pi Imager app on the Raspad OS - it doesn't work. It doesn't display the Operating System nor Storage - pull-down selection options.
(EDIT: Just checked it doesn't work on Raspberry Pi OS either - on the Raspd3 hardware)