You can store file attachments in the Suite in several different ways and you can vary storage based on your preference for the various Suite areas and applications. Options include:
Use if you want to store files externally on a server optimised for rendering files or a third-party storage service.
Default option which is sufficient for most environments. This stores files on your local server with no special configuration needed.
Amazon Web Services (AWS) S3
Remote storage system recommended for very busy sites. Service fees apply.
Use if you do not have much file storage space available or file writes are undesirable for your server environment. Will require more server resources to display a file.
You can also define how different areas of the Suite store their files. So you might choose File System for most files but AWS S3 for Theme Resources so you can enable a CDN.