Copying File & Folders within its own directory?

Hi been messing with this for a while and im stuck

I have a folder called Test Files

Within that folder is a folder called Music Test

What im trying to do is move the contents of the Test Files Directory whether they be files or folders to a sub directory to be created within the Test Files Directory called Upload

The only way i have managed it so far is by copying them to @TempDir and back into Upload using DirCopy, but the problem is some of the files could be 8GB + so a long copy progress on slow machines is a no no

It seems to resist being moved within itself

Any suggestions please?