* NFS server on an Android smartphone without root access: "Testing: Termux, proot-distro, Network File System (NFS)" at https://gist.github.com/NoteAfterNote/e1719f4029b91918d99621... (gist.github.com/NoteAfterNote/e1719f4029b91918d996216939d5bff2)

* Kodi has an NFS client, "Downloads for Android": https://kodi.tv/download/android/

* VLC for Android, Android TV and ChromeOS, "Network browsing for distant filesystems (SMB, FTP, SFTP, NFS...) and servers (UPnP, DLNA)": https://github.com/videolan/vlc-android , https://www.videolan.org/vlc/download-android.html

* "NFS Clients VLC & KODI on Android TV": https://www.hallergard.com/Blog/NFS_Android.html

* "exportfs Command: Tutorial & Examples" "Manage and display NFS exported file systems on a Linux server": https://cleveruptime.com/docs/commands/exportfs

* "NFS Security: Identifying and Exploiting Misconfigurations": https://www.hvs-consulting.de/en/blog/nfs-security-identifyi... (www.hvs-consulting.de/en/blog/nfs-security-identifying-and-exploiting-misconfigurations)

Why not SSH (SFTP)?