If you need the storage to be responsible for file services (formatting the filesystem, file-level security access etc) then CIFS or NFS will be your protocol of choice. The following table compares the different aspects of the two solutions: SharePoint.FTP lets people and applications exchange and share data within their offices and across the Internet. Most of these can also be implemented on a Raspberry Pi NAS. minio - High Performance, Kubernetes Native Object Storage.
Ftp vs nas File Transfer Protocol (FTP) is a widely used network protocol for transferring files between computers over a TCP/IP-based network, such as the internet.