Read-only file system error while uploading image/files in django site in Vercel hosting

Question

I have deployed my django site in vercel(using free hosting plan). Now while I am trying to create a model object (which has image/file field) from admin panel, is not saving. Instead of this it is showing that OSError at /admin/portfolio/biodata/add/ [Errno 30] Read-only file system: '/var/task/media' I think media folder is saved in /var/task/media this directory and this directory doesn't have any permission to write it. Here is my models.py:

class Biodata(models.Model):
    name = models.CharField(max_length=100)
    profile_pic = models.ImageField(upload_to='img/profile_pic')
    about_me = models.TextField()
    cv_file = models.FileField(upload_to='files')
    created_at = models.DateTimeField(auto_now_add=True, blank=True, null=True)
    ....
    ....

    def __str__(self):
        return self.name

Now, can anyone tell me that how can I override the permission or solve this issue so that I can upload images or files from admin panel.

Thanks in advance.