CopyParty is a portable file manager that consists of a single python file. Even though it should be easy enough to install for everyone, it could be a nice addition to DietPi.

It's blazing fast and turns almost any device into a file server with resumable uploads/downloads using any web browser. The server only needs Python (2 or 3), all dependencies optional.

It supports these protocols: http(s) // webdav // sftp // ftp(s) // tftp // smb/cifs

https://github.com/9001/copyparty