[Python] Error 5455 when uploading to Cloudflare images using python library

I use the latest version of the python library from Cloudflare to try to upload an image programmatically to my Cloudflare Images account. The code is quite simple:

import io
from pathlib import Path
from cloudflare import Cloudflare

if __name__ == '__main__':
secrets = loadSecrets()
image = Path("E:/").joinpath("test", "test_pict.jpg")
cf = Cloudflare(api_token = secrets["image"]["apitoken"])
with open(image, "rb") as imgfile:
res = cf.images.v1.create(account_id = secrets["accid"], file = imgfile)


Since the documentation is very generic about the "file" parameter:

def create(self,
*,
account_id: str,
file: object | NotGiven = NOT_GIVEN,
metadata: object | NotGiven = NOT_GIVEN,
require_signed_urls: bool | NotGiven = NOT_GIVEN,
url: str | NotGiven = NOT_GIVEN,
extra_headers: Mapping[str, str | Omit] | None = None,
extra_query: Mapping[str, object] | None = None,
extra_body: object | None = None,
timeout: float | Timeout | None | NotGiven = NOT_GIVEN) -> Image

Upload an image with up to 10 Megabytes using a single HTTP POST (multipart/ form-data) request. An image can be uploaded by sending an image file or passing an accessible to an API url.

Args:
account_id: Account identifier tag.
file: An image binary data. Only needed when type is uploading a file.
...


I tried various options:

res = cf.images.v1.create(account_id = secrets["accid"], file = image)
res = cf.images.v1.create(account_id = secrets["accid"], file = imgfile.read())
res = cf.images.v1.create(account_id = secrets["accid"], file = io.open(image, "rb)


but always throws the same error:

cloudflare.APIStatusError: Error code: 415 - {'result': None, 'success': False, 'errors': [{'code': 5455, 'message': 'Uploaded image must have image/jpeg, image/png, image/webp, image/gif or image/svg+xml content-type'}], 'messages': []}
​

The image is a 2.5MB Jpeg (I checked the header with Hex Editor, just in case). Any educated guess on what else I should try that may fix that will be most appreciated.

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