@ZeusMR if you choose to accept the challenge on submitting a Rockon for fileserver, I would recommend to focus on the version (tag) that uses linuxserver’s s6 overlay instead of the alpine version:
That will then allow you (in typical linuxserver.io fashion) to specify a User and Group ID that then also should allow to contain the container to managing files/directories that you want (as opposed to root, unless that’s what you are looking for).
If you’re looking for a quick option to manage/copy/move files without using the command line (or doing it, say, from Windows Explorer on a connected machine), then you could install something like Midnight Commander and access it through the Rockstor Shell in the WebUI. Some time ago, there was a discussion around that:
Obviously comes with pros and cons as well, and depends on what your use case is.
Good luck.