You described the stain to an assistant for twenty minutes. You now know more than you did, and none of that knowledge is a work order.
A landlord needs: when it started, where it is, what you already did, and what you want them to do.
Write it as they will file it
Unit, date opened, "water on the ceiling below the bath," towels down, shutoff tried or not. Then one ask: send someone this week, or tell me the date.
State assumptions if you have them — "we have not run the shower since Tuesday" — so they do not invent a story.
Leave the chat behind
The session where you asked whether this is "an emergency" manufactured confidence. It did not inspect the pipe. Context does not transfer by pasting, and a landlord should not have to watch you think.
They will answer from a mailbox
No account required. If they ignore it, you have a record of what you asked and when. Follow up with the same ask, not a louder theory.
If a photo matters, send it the way they already collect maintenance pictures. The briefing holds the words.