Can't add border onto Adaptive Cards images or render images in tables in Teams

Hi there - I'm trying to add a border to an image, but I'm running into problems. One, it seems like the style feature for an image doesn't allow actual css, instead it allows me to specify person or default which is kind of weird. Then, when I try to render the image in a table since table allows me to show the border, it gives me an image cannot be found icon, despite it rendering perfectly fine before.

Ex 1:

"contentType": "application/vnd.microsoft.card.adaptive",
                    "content": {
                        "type": "AdaptiveCard",
                        "version": "1.5",
                        "body": [
                            {
                                "type": "Image",
                                "style": "border: solid;",
                                "url": "https://dogfood-staging.global.ssl.fastly.net/s/image/yB5yjZ/gzz-usf-xgq.png"
                            }
                        ]
                    }

Style doesn't work 😞

Ex 2:

"content": {
                        "type": "AdaptiveCard",
                        "version": "1.5",
                        "body": [
                            {
                                "type": "Table",
                                "columns": [
                                    {
                                        "width": 100
                                    }
                                ],
                                "rows": [
                                    {
                                        "type": "TableRow",
                                        "cells": [
                                            {
                                                "type": "TableCell",
                                                "items": [
                                                    {
                                                        "type": "Image",
                                                        "url": "https://dogfood-staging.global.ssl.fastly.net/s/image/yB5yjZ/gzz-usf-xgq.png"
                                                    }
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },

Shows up as the following (see attached image):

Also, MS Teams currently only supports adaptive cards v1.5 or below? When will it support higher versions?