It’s worth noting that KDE Connect works on more desktops than just KDE Plasma. It also supports Linux, Android, iOS, Windows, MacOS, and probably other operating systems, and can do more than just transfer files.

Local Send is all you need.

In termux (base python module):

python -m http.server 8080

In linux desktop browser:

http://192.168.100.1:8080/ # your ip in `ifconfig` and port

or vice versa.