As I have a outdated computer, and I try to use it as a nas and a download machine. So I install debian on it without gui, as I found fdm having remote control feature. I install it on debian and try to run it on the terminal but failed. So can i use fdm as usual on my Windows computer and when i want to download something, i can choose to save it at loacal machine or use my nas to download it on the download dialog.

Hello,
Unfortunately, such a feature is not available at the moment.