That would be one of KDE Connects' main functions, yes. It makes sharing any kind of file (photos, videos, whatever) easy.
You can also share the content of your clipboard from your desktop to your phone and vice versa. So you would copy, say, a web address on your desktop, and you would be able to paste it into your web browser on your phone immediately.
KDE connect es ya un buque insignia de la conectividad para los amantes del #softwarelibre y si no es por KDE ni sabríamos que Gates ha sacado una nueva basura al mercado.
They probably mean they don't provide support via the official channels due to the support being experimental, instead you'd report bugs directly to the kdeconnect-mac repo.
It works on all platforms, I work on mobile apps so I have quite a few Androids and iPhones, as well as a linux laptop and a Mac mini. It works seamlessly between all of those.