Api Route or Server Action for ImageKit upload

Error: Only plain objects, and a few built-ins, can be passed to Server Actions. Classes or null prototypes are not supported.

  function onSubmit(values: z.infer<typeof formSchema>) {
    let res = fileUpload(values.image[0]);
// Other code
  }

"use server";

import ImageKit from "imagekit";

const imageKit = new ImageKit({
  publicKey: process.env.IMAGEKIT_PUBLIC_KEY!,
  privateKey: process.env.IMAGEKIT_PRIVATE_KEY!,
  urlEndpoint: process.env.IMAGEKIT_URL_ENDPOINT!,
});

export const fileUpload = async (file: File) => {
  const arrayBuffer = await file.arrayBuffer();
  const buffer = Buffer.from(arrayBuffer);

  const response = await imageKit.upload({
    file: buffer,
    fileName: file.name,
    useUniqueFileName: true,
    tags: ["post"], // TODO: Add tags
  });

  return response;
};