Linux

I use kdeconnect with this script: https://github.com/Samueru-sama/kdeconnect-any-filemanager

The android nextcloud client works great if you're willing to setup/maintain a nextcloud server.

I'll throw out another way: to access files from your phone, you can use termux. python -m http.server

wifi file explorer pro apk

samba. share a folder on pc, and on your phone use a file manager that can access smb folders in your local network, then just copy or move from or to that folder. bit of a hassle to set up the first time, but makes things more convenient in the long run.

X-plore on android can give file access via Web frontend in paid Version.

With that you can drag and drop files if that's what you're looking for.

I use Airdroid! It's free and works very well

snapdrop.net if on the same network

My go to hack was quickly running a python http server and connect to it. I can't remember what the command was exactly. Something like python -m http.server or so, then connect to the ip from my phone, heh.

Croc or syncthing depending on what kind of experience you are after. Syncthing if you want to have a shared folder like expert. And croc if you just need to send something. Croc has an app on f-droid, and syncthing is on the app store. Both are open source and pretty for excellent in their own right.