Before I explain my setup, realize a simple one-way, two-device setup can be done quickly and easily. https://docs.syncthing.net/intro/getting-started.html
I have it set up on my phone (android), desktop (Devuan), laptop (MX Linux), and a server (DietPi).
I have the DCIM picture folder synced one-way from the phone to the server, and one-way from the server to the desktop and laptop. As soon as a new picture is taken and a network is in range, the photo is synced.
I also have separate sync folders set up for other purposes: "music" - all-way, all devices. "keyring" for password manager - all-way except one-way to phone. "sync" - All-way, all devices except phone. "syncmobile" - all-way, all devices
Right now sync only happens over WiFi connections (local and remote) for "reasons". It's been that way for years and it's been enough. I'm still contemplating cellular data.
You should add something about Arch Linux to your title. I have been transferring phone files (including photos) to and from my Windows computers using USB ever since I've had a camera in my phone, works great.
You could set up a network share and then use a file browser on your phone to just copy and paste the files.
If you want a method not depending on any service (and assuming you have an android), get Termux for your phone, and have a home screen shortcut to start a web server that you can browse on your computer.
Nothing wrong with that, it integrates well with the phone's UI (which isn't setup well for the whole "remote access from somewhere else" situation) and is often the easiest for sending a small number of photos right now.
But here is another alternative:
https://f-droid.org/en/packages/org.primftpd/
It will let you do ftp or sftp and so you can log into the phone and download batches of photos all at once (or, upload batches of photos to the phone all at once).
Sneaker net is why sd cards in my smart phones are not encrypted ...
https://www.photosync-app.com/home There may be other apps that set up a server (i.e. http, ftp ...) on the phone. Ask Google.
If you use a single IMAP email account, a slight optimization is to not click “send”, but just save a draft message. IMAP, sort-of, is a remote file system.
should be in electronic sites; EEVBlog, allaboutcircuit, etc instead