You could probably have done something similar using Android with Termux, yes. I use rsync in Termux to move files to or from my phone all the time. Android is

You could probably have done something similar using Android with Termux, yes. I use rsync in Termux to move files to or from my phone all the time. Android is a complete mess when it comes to app permissions and the file system, so I would not dare to guess if it would be possible to access a USB drive from within Termux or not. I preferred SailfishOS on my Jolla Phone (and my Jolla Tablet) as the experience is much better with how you can access files on the file system etc. But for various reasons (including a cracked phone screen) I went back to Android several years ago.