it just uses your local wifi. run it on your machines, tell them to trust each other, and you're set. and if you manage to edit the same file at once, it handles the conflict and saves both copies.
for anyone who just wants to get files from point a to b without the headache. hope it makes your life a bit less annoying.
github: https://github.com/sirbread/sink binary: https://github.com/sirbread/sink/releases/tag/v0.1
Keep in mind that not everyone sharing their work here is a grizzled veteran. Some are enthusiastic people learning to do something for the first time. The community here should welcome such users, not beat up on them, which is the effect that a comment like yours can all too easily have (though I'm sure this was not your intent).