uploading buffer to did space creates empty file

(2024-10-16 18:38:41): File Details: {
(2024-10-16 18:38:41):   originalname: 'cafe-theme.mp3',
(2024-10-16 18:38:41):   mimetype: 'audio/mpeg',
(2024-10-16 18:38:41):   size: 3319557,
(2024-10-16 18:38:41):   bufferSize: 3319557
(2024-10-16 18:38:41): }

import { PutObjectCommand, SpaceClient } from '@did-space/client';
import type { Request, Response } from 'express';
import { authService, wallet } from '../../libs/auth';
import multer from 'multer';

const upload = multer({
  storage: multer.memoryStorage(), // Store file in memory temporarily
});

export default async function $post(req: Request, res: Response) {
  upload.single('file')(req, res, async (err: any) => {
    if (err) {
      return res.status(500).json({ message: 'File upload error', error: err });
    }

    // Extract the file from the request
    const file = req.file;

    if (!file) {
      return res.status(400).json({ message: 'No file uploaded' });
    }

    // Log file details for debugging
    console.log('File Details:', {
      originalname: file.originalname,
      mimetype: file.mimetype,
      size: file.size,
      bufferSize: file.buffer ? file.buffer.length : 'No buffer',
    });

    // Check if buffer exists and has content
    if (!file.buffer || file.buffer.length === 0) {
      return res.status(400).json({ message: 'File buffer is empty' });
    }

    // Authenticate the user
    const { user } = await authService.getUser(req.user?.did as string);
    if (!req.user) {
      return res.status(401).send('Unauthorized');
    }

    if (!user?.didSpace?.endpoint) {
      console.log(`DID Spaces endpoint does not exist. Log in again to complete the authorization`);
      return res.status(404).send('DID Spaces endpoint does not exist. Log in again to complete the authorization');
    }

    // Initialize SpaceClient
    const spaceClient = new SpaceClient({
      wallet,
      endpoint: user.didSpace.endpoint,
    });

    try {
      // Upload the file to DID Space
      const output = await spaceClient.send(
        new PutObjectCommand({
          key: file.originalname || 'test.mp3',
          data: file.buffer,
        })
      );

      if (output.statusCode !== 200) {
        console.log(`Error!`, output);
        return res.status(output.statusCode).send(output.statusMessage);
      }

      return res.status(200).json({ message: 'File uploaded successfully' });
    } catch (uploadError) {
      console.error('Upload error:', uploadError);
      return res.status(500).json({ message: 'Error uploading file', error: uploadError.message });
    }
  });
}