

There’s always Termux and whatever you can install there. That sounds silly, but when I download from my phone, I do it using aria2c
in Termux. It works great, and everything (AFAIK) is FOSS. zsh + fzf history completion/file finding (<c-T> is a godsend) makes it possible to use a CLI on a phone without going crazy. Only really works well if you’re already comfortable with the command line, which is definitely a big if. It works really well for me, but I’m one of those weirdos that doesn’t have a graphical file manager installed on their computers.
Huh, interesting! Sounds like it’ll be perfect for OP.