The method of pulling down the xlsx signature is:

1. Open the signature file in Excel and place the cursor at the signature position. Click the "Picture" button in the "Insert" tab and select the "Picture" button.

2. In the dialog box that opens, select the image file you want to use as your signature, and then click the "Insert" button.

3. After the picture is inserted into Excel, select the picture, and then click the "Size and Properties" button in the "Format" tab.

4. In the "Size and Properties" tab, select the "Lock Aspect Ratio" and "Lock Size" options, and then adjust the size and position of the picture.