python-pptx insert picture in PlaceholderPicture

I'm trying to insert a picture in a pptx Placeholder

for shape in presentation.slides[(len(presentation.slides) - 1)].placeholders:
    print(shape.name)
    print(shape.shape_type)
    print(shape.placeholder_format.type)
    
    if "Bild" in shape.name:
        shape.insert_picture(os.path.join(self.image_folder, "media_value.png"))

my output:

Bildplatzhalter 17
PLACEHOLDER (14)
PICTURE (18)

the error:

shape.insert_picture(os.path.join(self.image_folder, "media_value.png"))
AttributeError: 'PlaceholderPicture' object has no attribute 'insert_picture'

From the Documentation, it should work like this.
what i'm doing wrong?

python3.9
python-pptx0.6.21

The placeholder you are inserting into needs to be a picture placeholder rather than a text one.

from pptx import Presentation
from pptx.util import Inches

# Create a new presentation object
presentation = Presentation()

# Specify the slide layout. Slide layouts 8 has a picture placeholder
slide_layout = presentation.slide_layouts[8]

# Add a slide with the specified layout to the presentation
slide = presentation.slides.add_slide(slide_layout)

# Specify the placeholder. Placeholder 1 is the picture placeholder.
# Choosing another placeholder will return an error
placeholder = slide.placeholders[1]

# Specify the path to the image file
img_path = "Animal 1.jpg"

# Add the image to the placeholder
placeholder = placeholder.insert_picture(img_path)

# Save the presentation
presentation.save('image.pptx')