So as the lack of answers indicates there are no ready to use file managers for elixir (to my knowledge). Personally I feel that the existence of such a thing is more the exception than not having a file manager in an ecosystem though. There are a lot of interconnected pieces/technologies needed to make such file managers work and most often there’s no clear cut standard of handling things across all those pieces, especially when it comes to frontend vs. backend.

There’s https://uppy.io/, which seems like a nice backend agnostic file management solution, but I’m not sure if there’s folder management in there.

bump

Have you looked at I've forked Arc to Waffle and merged all open PRs?

It doesn’t have everything you ask for but it’s a good start.