[Feature] Mastodon notifications - Be able to have stream preview image attached to post

[CommanderRoot]

In general this seems like a straightforward idea. However media upload delays / queues are not uncommen, especially on bigger instances. In this case the media upload might still work but then using the media to create a post would result in an error because the media isn't ready yet. We then could either:

• Retry the post without the media
• Retry the post with the media after xx minutes
• Skip posting the notification

Neither of these solutions is great so not sure what the best one would be for a feature like this.