Use a PDF editor
Just put the image at the bottom
I personally tested it and recommend using Foxit PDF Editor VersionF file editing software for processing.
How to use Foxit PDF Editor:
1 Delete open the PDF file, click the left button of the mouse to select the content to be deleted, press the del key, and the selected content will be deleted. In this way, only one layer of content can be deleted, and multiple layers of content must be deleted multiple times. You can select all and delete multiple contents.
2 To edit the selected content of the object, select "Object" "Edit Object" in the menu bar. The content becomes editable. To complete editing or cancel editing, click the button in the toolbar above.
After editing is completed, if the selected content is invisible, you need to select "Foreground" or "Background" before the content will be displayed normally.
3 To add text, select "Object" and "Add Text" in the menu bar. Select "Object Properties", open the "Options" window, select "Text" in the left window, select "Import Windows Fonts" on the right, and select a Chinese font. In this way, Chinese can be entered in the text input box.
4Select the page. Select the page turning button in the toolbar or the page turning button in the status bar at the bottom of the window to turn the page. You can also directly enter the number and press the Enter key.
5 Move the content. When the selected content becomes a selection box, hold down the left mouse button and move the mouse, and the content can be moved.
6 Save After editing the file, select "File", "Save" or "Save As" in the menu bar to save the file. A new PDF file is generated.
7 Create a new page to create a new page for the file. The size information of the new page can be modified when it is created, or it can be modified after it is created.
After installing the software and entering the registration code, you can open the PDF file and edit it. The built-in picture editing software is similar to the system's drawing and has very good functions.
When using it, be sure to keep a backup to avoid problems that may become difficult to recover after making changes.