Can the contents of $_POST be used directly by S3 Connector to save to a cloud storage?

Hi,

I am writing an inbound API and I want to save the contents of $_POST via S3 Connector to DigitalOcean Spaces. Do I need to save the $_POST to a server side file first and then send that file via S3 Connector or can I configure S3 Connector to directly use $_POST?

Thanks
Allan