It didn't appear to do either. No popup or message in status or msgwin on success. I don't recall seeing anything but some usual gtk errors in terminal.
Weird… unless you have a libsoup2 plugin loaded? IIUC nothing will stop you from doing so, but things will just perform bizarrely (or crashingly). Or maybe the plugin has more issues than I can see myself.
... by default the pastes are deleted after a while, and it just means that nobody had made a forever-paste since then.
I don't see how to use the geany pastebin service without the plugin. There's no web form I can find.
Ah, indeed, it was removed due to spam… quoting @eht16 from an internal mail:
I removed the form to create new snippets and related code [due to recurring spam]. Only the API endpoint is still available for the GeniusPaste plugin.
So indeed, only the plugin (or another API-based tool, like an oooold pastebinit configuration I have laying around). Anyway, that doesn't change much on whether this says anything to whether the plugin is in use or not, as the snippets expire anyway.