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.
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I can recommend syncthing. If it's a file you want to keep updated between the two devices, it's great and easy to set up. I use it for my password manager database.
Server or desktop, and what types of files? I find that a self-hosted version of NextCloud does pretty well for keeping contacts, images, and videos in sync.
(You could run it on a Pi as an intermediary to both if desired)
I used to use stuff like AndFTP in the past for similar functions
snapdrop.net
Simply install flatpak then install warpinator
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.
wifi file explorer pro apk
Mostly because I'm not the most competent techie, I've been using VLC between my PC and iPhone, for moving "books" around on devices that are very out of date.
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.
I use Airdroid! It's free and works very well
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.