Parameter "attachments" is invalid

Since I was having trouble with the payload generated by my app (even though it didn't change), I tried reproducing via the api explorer and was able to. Here is a simplified version:{ "groupId": "191750150", "attachments": [ { "type": "Card", "title": "test", "color": "Black", "allDay": false } ] }
A representation that is closer to what I'm trying to do: { "groupId": "191750150", "attachments": [ { "type": "Card", "title": "test", "color": "Black", "text": "[https://i.imgur.com/gQ3EeN3.gif](https://i.imgur.com/gQ3EeN3.gif)", "imageUri": "https://i.imgur.com/gQ3EeN3.gif", "allDay": false } ] }

A couple of comments.
I should have included my exact payload rather than the one I generated using the api explorer. This is my actual payload that was getting denied:
{
    "groupId": "191750150",
    "attachments": [
        {
            "type": "Card",
            "title": "[https://i.imgur.com/gQ3EeN3.gif](https://i.imgur.com/gQ3EeN3.gif)";,
            "imageUri": "https://i.imgur.com/gQ3EeN3.gif";
        }
    ]
}

This is what I found ended up working:
{
    "groupId": "191750150",
    "attachments": [
        {
            "type": "Card",
            "text": "[https://i.imgur.com/gQ3EeN3.gif](https://i.imgur.com/gQ3EeN3.gif)";,
            "imageUri": "https://i.imgur.com/gQ3EeN3.gif";
        }
    ]
}

Basically, the title was causing it to fail. Switching that to "text" made it work. However, that used to work. Also, having both "title" and "text" works fine too.

I'll also add that the api reference generates the value "black" for color... which is why it was included in my sample. It would be good if that was updated to be hex because right now you can't get posts to generate since that is a drop down with only invalid values.

I'm unblocked. Thank you.