KDE Connect works well on most things I use it with, but hunting down the builds for Windows/OSX is difficult, and might not be super well-maintained. For example, KDE Connect will share files between my devices just fine on Mojave, but it's broken beyond Big Sur afaict.

As someone who mainly shuffles things around Linux/Android/Windows devices, this is pretty much perfect for me. YMMV: https://kdeconnect.kde.org/