alt Hacker NewsKDE has phone and laptop integrated well enough for me. It's worth giving it a try but the more devices you want integrated the more of a risk it is in case it doesn't quite work right. But I've got enough other devices in the house which I can't put KDE on (work laptop, Windows machine I need for some specific software) that I can recommend https://github.com/9001/copyparty over thumb drives.
I actually intended to set everything up but did not have time and needed to copy some files, so dusted off a thumb drive. I am liking it quite a bit and I think I prefer it to the alternatives.