How to make File type input optional

[ashrane111]

I am taking two inputs of file type for an API. I want to make it so that the input fields can be optional. But it seems I cannot make file type input optional.
I have tried passing parameters like "nullable=True" and "allow_none=True" . What this does is, it removes the option to upload the file.

I have also set docs_ui = "elements". If I use the previous UI which is provided by swagger, it does give me an option to send empty value for file upload.

Another solution to this is,
in APIFlask.fields.File

def _deserialize(self, value, attr, data, **kwargs) -> t.Any:
from werkzeug.datastructures import FileStorage
if not isinstance(value, FileStorage):
raise self.make_error('invalid')
return value

Here if there is an option to return None rather than raise an error, it would work

Any help would be appreciated