When I try to transfer files, a pop up says they are already in use

When I try to transfer files, a pop up says they are already in use. Also when I run Mac utility first aid, it says drive will not unmount. Trying to get these files off of the drive before trying to format. Any suggestions?

Hi @Stones,

Thanks for reporting the issue. Have you opened a Support Case? If not please click here and open a new support case to assist in the best possible way.

Just sent in the ticket.
Thanks!

It happened to me too, but I was reckless and formatted.
Hope you resolved this without formatting or resetting the device.

Just sent in the ticket.. .