I need to host 1 static small file to be accessible worldwide with high speed

What is the name of the domain?

example.com

What is the error number?

1

What is the issue you’re encountering

I need to host 1 static small file to be accessible worldwide with high speed.

What steps have you taken to resolve the issue?

If i use the r2 bucket, will it use the CDN network? Or just one storage location?

The CDN is included by default if you use a custom domain.

See: Public buckets · Cloudflare R2 docs

But I’m curious: what type of file is this?

If it’s a text file, perhaps you could also serve it via a worker.

Or if you have an origin server, is it something you can host there and set a long expiration date (if the file does not change) for the standard proxied hostname to have Cloudflare cache it?