File Storage in Separate Data Store Area to App

As I plan the hosting of my app, I want to have a separate file store area to the where my code is hosted… I will probably use AWS and use EC2 for hosting the app, and S3 for hosting the files.

The Server Actions seem to only give options to upload files to a data structure within the app hosted environment… is there a way to choose a file store outside of the app root, on a different server?

Best wishes,
Antony.