Your teacher gets your piece with your first name on it. Nothing else is sent.
No recording loaded. The 8 bars are played by the built-in band over I (one) vi IV V.
Everything above is a guess made from the music itself, and every box can be corrected. The tempo follows from the recording's own length divided by its bars, so the loop can never drift out of time with the grid.
If the Tonal Centre sounds wrong, the usual mistake is its relative major or minor - three semitones away, and made of exactly the same notes, so nothing in the sound separates them. A minor is C major's relative; try that before anything else.
To put a piece in front of a class, load it, check the numbers, then press Save my piece with no notes on the lines. The music travels inside that file - hand that file out as the starting point.
Create a class code once, with a teacher key only you know. Children hand in with the code; only the key opens the class. Pieces are kept for 400 days, then deleted.