How to thread the upper thread with an industrial sewing machine?

1. First, put the thread on the tray and thread it out of the empty place.

2. Then thread the thread from below and then go around it.

3. Go down from below and go around again.

Put the thread in that slot.

5. Put the thread on from below, then into the space above, and then put it on.

6. grind it step by step.

7. Finally, thread the needle. Pay attention to the line from the left to the right of the needle. That's good.