File Holder

On the right side of your screen your going to see this, click a red box.
Create the Base

Make the width 30 and make the length 70.
Duplicate the Piece

Now you are going to duplicate the piece with the button in the top left corner and move it up with the black arrow on top.
Create the Sides

You are now going to add another square and make its length 70 and width 1.5
Add Another Side

For this step you are going to duplicate like we did before but move it to the other side
Create the Back Piece

For this step you add another box to the back
Final Product

Here is the final product