multipart/form-data request to Google Drive API in React Native

I’m trying to send a multipart/form-data request to the Google Drive API from my React Native app.
When I use Postman, the request works perfectly, but when I try to implement the same request in React Native using fetch or axios, I keep getting a “Malformed multipart body” error.

I’m constructing the request using FormData, adding metadata (metadata) and the file (file).
This setup works fine in Postman, so I suspect there’s something different in how React Native handles FormData or the Content-Type header for multipart requests.

Has anyone experienced this issue in React Native?
Is there a specific way to configure FormData to behave the same way as it does in Postman?
Or, if you have any recommendations for alternative approaches to send multipart/form-data requests from React Native, I’d really appreciate the guidance.

Thanks in advance for any help!

export const uploadToGoogleDrive = async (data) => {
  try {
    const accessToken = await signInWithGoogle();
    const fileName = data.title;
    const fileDescription = data.description;
    const file = data.file;
    const fileMimeType = file.assets[0].mimeType;

    const formData = new FormData();

    formData.append("metadata", JSON.stringify({
      name: fileName,
      mimeType: fileMimeType,
      description: fileDescription,
      parents: [GOOGLE_DRIVE_FOLDER_ID]
    }), { type: 'application/json' });

    formData.append('file', {
      uri: file.assets[0].uri,
      type: fileMimeType,
      name: fileName,
    });

    const response = await fetch(`${GOOGLE_DRIVE_ENDPOINT}/files?uploadType=multipart`, {
      method: 'POST',
      headers: {
        'Authorization': `Bearer ${accessToken}`,
      },
      body: formData,
    });

    if (!response.ok) {
      const errorText = await response.json();
      console.log("Detailed Error:", errorText);
      throw new Error(`Error uploading file: ${response.statusText}, details: ${errorText}`);
    }

    return response;

  } catch (error) {
    console.error("Upload error:", error);
    if (error.response) {
      console.error("Response data:", error.response.data);
    } else if (error.request) {
      console.error("Request details:", error.request);
    } else {
      console.error("Error:", error.message);
    }
  }
};