I cannot get this to work.

I open up my USB.
I add the folder into the accounts. (Content>)
Unplug from computer.
Unplug internet cable from xbox.
Insert USB.
Turn on xbox.
???
Profit.

Literally, ???. I'm apparently missing something there, as no new files show up on my xbox, and when I try deleting the file off of my USB, an error occurs.

Edit; Resolved.
I used my backup flash with the process above, and it somehow worked.