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Zavilo returns browser File objects, so standard multipart/form-data upload patterns work without conversion.

const form = new FormData();
form.append("file", result.files[0], result.files[0].name);

await fetch("/api/upload", {
  method: "POST",
  body: form
});

const form = new FormData();

for (const file of result.files) {
  form.append("files", file, file.name);
}

form.append("executionId", result.executionId);

await fetch("/api/upload-many", {
  method: "POST",
  body: form
});

if (result.archive) {
  const form = new FormData();
  form.append(
    "file",
    result.archive.file,
    result.archive.file.name
  );

  await fetch("/api/upload-archive", {
    method: "POST",
    body: form
  });
}