Python: JPEGs from folder to a Multipage-PDF with img2pdf

I'm an newbie and I'm trying to create a multipage pdf with img2pdf (recursive), but only the last picture is saved in a pdf file.

from pathlib import Path
import os
import img2pdf

main_dir = Path(Path.cwd(),'MAIN')

for subfolder in main_dir.iterdir():
if subfolder.is_file():
    continue
    
    for filename in subfolder.iterdir():
        #pdf as foldername
        pdf_name = os.path.basename(subfolder)
        #write image-file to pdf file
        with open(pdf_name+".pdf", "wb") as f:
                f.write(img2pdf.convert(str(filename)))

When I test it with print(filename) all images are going through the loop.

Maybe someone can tell me where my misconception is.

img2pdf module can directly take a list of image file names as an argument and converts them into pdf. Take a look at the documentation here

from pathlib import Path
import os
import img2pdf


main_dir = Path(Path.cwd(),'your/path/to/images/folder')

for subfolder in main_dir.iterdir():
    imgs = []

    if subfolder.is_file():
        continue

    for filename in subfolder.iterdir():
        imgs.append(os.path.join(subfolder, filename))

    pdf_name = os.path.basename(subfolder)

    with open(pdf_name+".pdf", "wb") as f:
        f.write(img2pdf.convert(imgs))