Mirror: The highly customizable and versatile GraphQL client with which you add on features like normalized caching as you grow.

Add note about extending File (#3692)

Changed files
+3
docs
+3
docs/advanced/persistence-and-uploads.md
···
[file input](https://developer.mozilla.org/en-US/docs/Web/API/File/Using_files_from_web_applications),
for example.
The `@urql/core@4` package supports File Uploads natively, so we won't have to do any installation
or setup work. When `urql` sees a `File` or a `Blob` anywhere in your `variables`, it switches to
a `multipart/form-data` request, converts the request to a `FormData` object, according to the
···
[file input](https://developer.mozilla.org/en-US/docs/Web/API/File/Using_files_from_web_applications),
for example.
+
> **Note:** If you are using your own version of `File` and `Blob` ensure you are properly extending the
+
> so it can be properly identified as a file.
+
The `@urql/core@4` package supports File Uploads natively, so we won't have to do any installation
or setup work. When `urql` sees a `File` or a `Blob` anywhere in your `variables`, it switches to
a `multipart/form-data` request, converts the request to a `FormData` object, according to the