I'm no expert on this, so I'm not 100% sure:-
Do you have access to php.ini which controls php? Because the fault is that the file is bigger than the upload_max_filesize under File Uploads. If you change this to something crazy like 100M then it works, you know you've found the problem.
If you don't have access to php.ini I'm not too sure. Contact your admin? You could try and upload/move a smaller file and if this works at least you know the problem, even if you can't fix it 😃
I had this problem with file uploads but I would imagine it's the same for moving!
Thanks
Richard