Send pictures straight from a Canon

How to set a Canon up to send its pictures straight into the party's gallery during the evening.

The address and the port

Server: bridge01.whatwemissed.com · Port: 54000

This is what the details look like. The exact server address is on the settings card you get from the host — copy it from there along with the username and the password. The port is never 21.

How to set it up

The menu is called "Network settings" → "Connection settings" on most EOS bodies.

Connect the camera to wifi or a phone hotspot. FTP transfer needs the internet, not just a local network.
Go to Network settings → Connection settings → create a new setting and choose FTP transfer.
Choose FTPS where the camera asks for a mode. Canon calls it "FTPS" and then asks about a root certificate — the camera uses the ordinary one, so you do not need to load your own.
Enter the server address and the port from the settings card — the port is printed there, and it is never 21. The camera does not fill it in for you.
Choose passive mode if the camera asks. Active mode is not accepted.
Enter the username and password from the card. The password is long on purpose; take your time.
Leave the target directory empty, or set it to a single slash. The camera does not need to create a folder.
Set image quality to JPEG. RAW files are refused, and the camera then shows a transfer error that does not explain why.
Turn on automatic transfer after shooting, so pictures leave while you keep working.

Four things that hold whatever the camera body is

JPEG or HEIF is accepted. RAW is refused — the files are too large and need developing, and that is not something that should happen in the middle of a dinner.
FTPS (explicit TLS) is the default. Unencrypted FTP can be turned on by the host, but should not be used: both the password and the pictures then cross the network unprotected.
There is no directory structure to navigate. The server receives files and does nothing else — it cannot list, fetch or delete anything.
The feed stops accepting when the album's window closes, and the host can revoke it at any time.