Can anyone tell me what is wrong in my code?

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Python

I want to upload multiple images by FastAPI and convert it to grey scale images.
so I have written the following code but it throws some error :

File "C:\Users\SMRUTI\Desktop\grey\.\multi.py", line 17, in upload_images
with open(f'{file.filename}',"wb") as buffer:
AttributeError: 'list' object has no attribute 'filename'

What I have tried:

from typing import List
from PIL import Image
from fastapi import FastAPI, File, UploadFile
from fastapi.responses import FileResponse
import shutil
from werkzeug.utils import secure_filename

app = FastAPI()
async def get_image(file):
    filename = secure_filename(file.filename)
    with open(filename,"wb") as buffer:
        shutil.copyfileobj(file.file, buffer)
    return filename

@app.post("/uploadfiles/")
async def upload_images(file: List[UploadFile] = File(...),):
    with open(f'{file.filename}',"wb") as buffer:
            shutil.copyfileobj(file.file,buffer)
    return FileResponse (file.filename)

@app.post("/grey_image/")
async def create_grey_img(file:list[UploadFile]):
    filename= await get_image(file)
    img = Image.open(filename)
    img.convert('L').save('grey_img.jpg')
    return FileResponse("grey_img.jpg")