All events are sent with `url: null` in the content, which confuses the file pane in Riot
The title should be fairly descriptive :)
Here's the body sent by Fractal:
"content": {
"body": "Ooh, Fractal has an icon in the Papirus icon pack",
"url": null,
"msgtype": "m.text",
"formatted_body": null,
"format": null
},
The existence of the url
field is what Riot uses to populate the files panel.