2. Open the transparent or translucent plastic cover and use the notch page as the back cover.

3. Put the files or things like printing paper that need to be put into the book, and tidy them first.

4. Close the plastic cover.

5. Upper pull rod

6, observe whether there is distortion, dislocation,

7. If not, go to step 8; If so, go to step 1.

8. complete,