Linux

Simply install flatpak then install warpinator

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

Syncthing, KDE Connect

If you are on same network you can use

python3 -m http.server

It will launch a http server which will serve all the files in your computer.

snapdrop.net

If it's anything big I send it to my synology nas. If it's something small then I honestly just send it through Signal. Although, I do wanna try this kde connect thing out as well.

Syncthing!

SSH + Termux is one option. X-plore for Android is a good file manager with a bunch of options for transferring files over a network.

uhm, well you can't primarily because android is a hot mess (quick note: this is mostly me ranting about the hell that android is for no fucking reason)

First of all, android only supports MDNS since android 12 and newer, MANY years after the standard was even finalized and put into use. (like a concerning amount) And yes, you can technically use that networking on a per app level (since android 6 or 8 i think), if it's implemented, but most apps don't because they're android apps. And the ones that do are basically useless (very cool thanks android)

Ignoring this, let's say that you have a samba server, and have a local DNS config setup to get around the MDNS bullshit. Oops, funny story, android doesn't natively support SMB shares, because apparently they aren't real and don't fucking exist. Now to be clear, most file managers do actually support SMB, the problem here is that those are often shit, and only supported in the actual file manager itself. If you wanted to per se, mount a samba share on android on the FS level, it is either impossible, or REQUIRES ROOT ACCESS.

Man it's a good thing rooting is easy, and not super convoluted, or risks bricking your phone in the event that it's designed like utter shit and cannot recover from being flashed incorrectly. (to be clear, i don't know shit about rooting, because it's a fucking disaster, and i might be misrepresenting it here, but only rooting, everything else is accurate)

so basically, cool story, the only option here that you have is using apps that are specifically designed to implement their own file transfer functionalities and protocols. There is one redeeming factor to this, and it's the fact that rsync exists, and that it isn't shit, but rsync isn't samba, so eat shit android. Rest in piss you disaster of an OS.

LocalSend has been great for me. It also works over NetBird or Tailscale. The same goes for KDE Connect.

I've been using FolderSync (Pro in my case) for many years to sync files (automatically and/or on-demand) from my phone to my Linux server.

SSH along with the extra stuff it comes with like scp is the way forward.

The two following suggestions make use of secure shell.

Termux and then pkg install mc (MC is Midnight Commander)

Alternatively, if you are feeling brave and GUI, Total Commander here.

LocalSend or KDE Connect. Syncthing if you need to sync files (Like an important documents folder that always needs to be up to date between your PC and Phone)

I used KDEConnect in the past but ran into issues where somehow media sent to my phone wasn't saved somehow. Probably some permission issue but I didn't manage to fix it. Also the windows client only allows selection of one file at a time.

Recently I've tried out LocalSend and found it a much smoother experience.

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

I have tried KDE connect, and it never works when I need it to. I just send it to myself on Signal. It's the easiest, most non-bullshit way.

Primitive ftpd from fdroid is my go-to "too lazy to configure a cloud thing" solution. It is fast and just works.

I just use Nextcloud as a storage provider on a local computer.

In Debian KDE KDEConnect works well. Dont know about suse but can imagine it works there too

EDIT: grammar

Take a picture of your screen.

/s

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.

Install Termux and run sshd -D -d -p <port>

I've been using SSHelper together with rsync for years and it works perfectly. You can log in the first time with a password, and place your public key to use key based auth going forward.

In addition to doing this over WiFi I also often use a usb to ethernet adapter (usb side plugged into phone) to get better performance if I'm doing larger transfers, for example copying off a large number of photos.

Edit: looks like there's a note on the play store page about incompatibility with newer Android versions. Disappointing. I guess I'll have to find another solution when I eventually upgrade my phone.