You'll get the Cloudflare R2 Integration settings in Settings > App settings > Integration > Cloudflare R2.

You must purchase R2 before you can generate an API token.

Please follow the steps below to get the credentials:

In the Cloudflare dashboard, go to the R2 object storage page.

If you don't have any bucket, create by following this:

Follow this and create a bucket:

Now go to the R2 object storage page again and click on manage API token button:

Create an account API token:

Configure options:

Then you'll get the required credentials. 

Add this credentials to the integration settings and click on Save & authorize.

If everything is correct it'll show a success message and the status will be Authorized.

That's all! You've successfully integrate with Cloudflare R2. Now all files will be uploaded into Cloudflare R2 Cloud Storage.